asp.net interview questions part- 6

·  What distributed process frameworks outside .NET do you know?

Distributed Computing Environment/Remote Procedure Calls (DEC/RPC), Microsoft Distributed Component Object Model  (DCOM), Common Object Request Broker Architecture (CORBA), and Java Remote Method Invocation (RMI).

·  How do you retrieve the customized properties of a .NET application from XML .config file?

Initialize an instance of AppSettingsReader class. Call the GetValue method of AppSettingsReader class, passing in the name of the property and the type expected. Assign the result to the appropriate variable.

·  When would you use ErrorProvider control?

ErrorProvider control is used in Windows Forms application. It is like Validation Control for ASP.NET pages. ErrorProvider control is used to provide validations in Windows forms and display user friendly messages to the user if the validation fails.  E.g. if we went to validate the textBox1 should be empty, then we can validate as below

1). You need to place the errorprovide control on the form

private void textBox1_Validating(object sender,System.ComponentModel.CancelEventArgs e)
{
ValidateName();
}
private bool ValidateName()
{
bool bStatus = true;
if (textBox1.Text == "")
{
errorProvider1.SetError (textBox1,"Please enter your Name");
bStatus = false;
}
else
errorProvider1.SetError (textBox1,"");
return bStatus;
}

it check the textBox1 is empty . If it is empty, then a message Please enter your name is displayed.

·  What is the difference between Debug.Write and Trace.Write?

The Debug.Write call won’t be compiled when the DEBUGsymbol is not defined (when doing a release build). Trace.Write calls will be compiled. Debug.Write is for information you want only in debug builds, Trace.Write is for when you want it in release build as well.

·  What are different transaction options available for services components?

There are 5 transactions types that can be used with COM+. Whenever an object is registered with COM+ it has to abide either to these 5 transaction types.

Disabled: - There is no transaction. COM+ does not provide transaction support for this component.

Not Supported: - Component does not support transactions. Hence even if the calling component in the hierarchy is transaction enabled this component will not participate in the transaction.

Supported: - Components with transaction type supported will be a part of the transaction if the calling component has an active transaction.
If the calling component is not transaction enabled this component will not start a new transaction.

Required: - Components with this attribute require a transaction i.e. either the calling should have a transaction in place else this component will start a new transaction.

Required New: - Components enabled with this transaction type always require a new transaction. Components with required new transaction type instantiate a new transaction for themselves every time.

·  What does it meant to say “the canonical” form of XML?

The purpose of Canonical XML is to define a standard format for an XML document. Canonical XML is a very strict XML syntax, which lets documents in canonical XML be compared directly.
Using this strict syntax makes it easier to see whether two XML documents are the same. For example, a section of text in one document might read Black & White, whereas the same section of text might read Black & White in another document, and even in another. If you compare those three documents byte by byte, they’ll be different. But if you write them all in canonical XML, which specifies every aspect of the syntax you can use, these three documents would all have the same version of this text (which would be Black & White) and could be compared without problem. This Comparison is especially critical when xml documents are digitally signed. The digital signal may be interpreted in different way and the document may be rejected.

·  What are the mobile devices supported by .net platform?

The Microsoft .NET Compact Framework is designed to run on mobile devices such as mobile phones, Personal Digital Assistants (PDAs), and embedded devices. The easiest way to develop and test a Smart Device Application is to use an emulator.
These devices are divided into two main divisions:
1) Those that are directly supported by .NET (Pocket PCs, i-Mode phones, and WAP devices)
2) Those that are not (Palm OS and J2ME-powered devices).

·  What is a Windows Service and how does its lifecycle differ from a “standard” EXE?

Windows service is a application that runs in the background. It is equivalent to a NT service.
The executable created is not a Windows application, and hence you can’t just click and run it . it needs to be installed as a service, VB.Net has a facility where we can add an installer to our program and then use a utility to install the service. Where as this is not the case with standard exe

·  What is the difference between repeater over datalist and datagrid?

The Repeater class is not derived from the WebControl class, like the DataGrid and DataList. Therefore, the Repeater lacks the stylistic properties common to both the DataGrid and DataList. What this boils down to is that if you want to format the data displayed in the Repeater, you must do so in the HTML markup. The Repeater control provides the maximum amount of flexibility over the HTML produced. Whereas the DataGrid wraps the DataSource contents in an HTML < table >, and the DataList wraps the contents in either an HTML < table > or < span > tags (depending on the DataList’s RepeatLayout property), the Repeater adds absolutely no HTML content other than what you explicitly specify in the templates. While using Repeater control, If we wanted to display the employee names in a bold font we’d have to alter the “ItemTemplate” to include an HTML bold tag, Whereas with the DataGrid or DataList, we could have made the text appear in a bold font by setting the control’s ItemStyle-Font-Bold property to True. The Repeater’s lack of stylistic properties can drastically add to the development time metric. For example, imagine that you decide to use the Repeater to display data that needs to be bold, centered, and displayed in a particular font-face with a particular background color. While all this can be specified using a few HTML tags, these tags will quickly clutter the Repeater’s templates. Such clutter makes it much harder to change the look at a later date. Along with its increased development time, the Repeater also lacks any built-in functionality to assist in supporting paging, editing, or editing of data. Due to this lack of feature-support, the Repeater scores poorly on the usability scale.
However, The Repeater’s performance is slightly better than that of the DataList’s, and is more noticeably better than that of the DataGrid’s. Following figure shows the number of requests per second the Repeater could handle versus the DataGrid and DataList

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asp.net interview questions part- 5

·  What does the volatile modifier do?

The system always reads the current value of a volatile object at the point it is requested, even if the previous instruction asked for a value from the same object. Also, the value of the object is written immediately on assignment.
The volatile modifier is usually used for a field that is accessed by multiple threads without using the lock statement to serialize access. Using the volatile modifier ensures that one thread retrieves the most up-to-date value written by another thread.

·  Is it possible to debug the classes written in other .Net languages in a C# project.

It is definitely possible to debug other .Net languages code in a C# project. As everyone knows .net can combine code written in several .net languages into one single assembly. Same is true with debugging.

·  How do you debug an ASP.NET Web application?

Attach the aspnet_wp.exe process to the DbgClr debugger.

·  What debugging tools come with the .NET SDK?

1.   CorDBG – command-line debugger.  To use CorDbg, you must compile the original C# file using the /debug switch.
2.   DbgCLR – graphic debugger.  Visual Studio .NET uses the DbgCLR.

·  What is the difference between structures and enumeration?

Unlike classes, structs are value types and do not require heap allocation. A variable of a struct type directly contains the data of the struct, whereas a variable of a class type contains a reference to the data. They are derived from System.ValueType class.

Enum->An enum type is a distinct type that declares a set of named constants.They  are strongly typed constants. They are unique types that allow to declare symbolic names to integral values. Enums are value types, which means they contain their own value, can’t inherit or be inherited from and assignment copies the value of one enum to another.

public enum Grade
{
A,
B,
C
}

·  What is Value type and refernce type in .Net?

Value Type : A variable of a value type always contains a value of that type. The assignment to a variable of a value type creates a copy of the assigned value, while the assignment to a variable of a reference type creates a copy of the reference but not of the referenced object.

The value types consist of two main categories:
* Stuct Type
* Enumeration Type

Reference Type :Variables of reference types, referred to as objects, store references to the actual data. This section introduces the following keywords used to declare reference types:
* Class
* Interface
* Delegate

This section also introduces the following built-in reference types:
* object
* string

·  What are the types of assemblies?

There are four types of assemblies in .NET:

Static assemblies
These are the .NET PE files that you create at compile time.
Dynamic assemblies
These are PE-formatted, in-memory assemblies that you dynamically create at runtime using the classes in the System.Reflection.Emit namespace.

Private assemblies
These are static assemblies used by a specific application.
Public or shared assemblies These are static assemblies that must have a unique shared name and can be used by any application.

An application uses a private assembly by referring to the assembly using a static path or through an XML-based application configuration file. While the CLR doesn’t enforce versioning policies-checking whether the correct version is used-for private assemblies, it ensures that an application uses the correct shared assemblies with which the application was built. Thus, an application uses a specific shared assembly by referring to the specific shared assembly, and the CLR ensures that the correct version is loaded at runtime.
In .NET, an assembly is the smallest unit to which you can associate a version number

·  What is manifest?

It is the metadata that describes the assemblies.

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asp.net interview questions part- 4

·  What can be stored in Web.config file?

There are number of important settings that can be stored in the configuration file. Here are some of the most frequently used configurations, stored conveniently inside Web.config file..

1. Database connections
2. Session States
3. Error Handling
4. Security

·  Difference between Web.config and machine.config.

web.config:
Web.config file, as it sounds like is a configuration file for the Asp .net web application. An Asp .net application has one web.config file which keeps the configurations required for the corresponding application. Web.config file is written in XML with specific tags having specific meanings.

machine.config
As web.config file is used to configure one asp .net web application, same way Machine.config file is used to configure the application according to a particular machine. That is, configuration done in machine.config file is affected on any application that runs on a particular machine. Usually, this file is not altered and only web.config is used which configuring applications.

·  Where we can use DLL made in C#.Net ?

Supporting .Net, bcoz DLL made in C#.Net semicompiled version. Its not a com object. It is used only in .Net Framework.As it is to be compiled at runtime to byte code.

·  If A.equals(B) is true then A.getHashcode & B.getHashCode must always return same hash code.

The answer is False because it is given that A.equals(B) returns true i.e. objects are equal and now its hashCode is asked which is always independent of the fact that whether objects are equal or not. So, GetHashCode for both of the objects returns different value.

·  To Configure .Net for JIT activation what do you do?

Actually JIT activation is required for COM+ components which can be done by setting JustInTimeActivation attribute to true (choice A). For .net applications / components JIT comes in by default.

·  How do you import Activex component in to .NET?

An application called AXImp.exe shipped with .Net SDK is used.
This application does something similar as Tlbimp.exe does for non graphical COM components.
It creates a wrapper component that contains the type information that the .Net runtime can understand.

·  What is the use of fixed statement?

The fixed statement sets a pointer to a managed variable and “pins” that variable during the execution of statement.
Without fixed, pointers to managed variables would be of little use since garbage collection could relocate the variables unpredictably. (In fact, the C# compiler will not allow you to set a pointer to a managed variable except in a fixed statement.)
Eg:

Class A { public int i; }
A objA = new A; // A is a .net managed type
fixed(int *pt = &objA.i) // use fixed while using pointers with managed
// variables
{
*pt=45; // in this block use the pointer the way u want
}

·  What is the order of destructors called in a polymorphism hierarchy?

Destructors are called in reverse order of constructors. First destructor of most derived class is called followed by its parent’s destructor and so on till the topmost class in the hierarchy.
You don’t have control over when the first destructor will be called, since it is determined by the garbage collector. Sometime after the object goes out of scope GC calls the destructor, then its parent’s destructor and so on.
When a program terminates definitely all object’s destructors are called.

·  How can you sort the elements of the array in descending order?

int[] arr = new int[3];
arr[0] = 4;
arr[1] = 1;
arr[2] = 5;
Array.Sort(arr);
Array.Reverse(arr);

·  Is it possible to Override Private Virtual methods.

No, First of all you cannot declare a method as ‘private virtual’.

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asp.net interview questions part- 3

·  How many types of validation controls are provided by ASP.NET ?

RequiredField Validator Control,Range Validator Control, RegularExpression Validator Control,Custom Validator Control and Validation Summary Control are provided by ASP.NET.

·  Can you explain what is “AutoPostBack” feature in ASP.NET ?

AutoPostBack is built into the form-based server controls, and when enabled, automatically posts the page back to the server whenever the value of the control in question is changed.

·  How can you enable automatic paging in DataGrid ?

Using the Built-In Paging Controls

To use default paging, you set properties to enable paging, set the page size, and specify the style of the paging controls. Paging controls are LinkButton controls. You can choose from these types: Next and previous buttons. The button captions can be any text you want. Page numbers, which allow users to jump to a specific page. You can specify how many numbers are displayed; if there are more pages, an ellipsis ( … ) is displayed next to the numbers. You must also create an event-handling method that responds when users click a navigation control.

To use the built-in paging controlsSet the control’s AllowPaging property to true. Set the PageSize property to the number of items to display per page.

To set the appearance of the paging buttons, include a element into the page as a child of the DataGrid control. For syntax, see DataGrid Control Syntax. Create a handler for the grid’s PageIndexChanged event to respond to a paging request. The DataGridPageChangedEventsArgs enumeration contains the NewPageIndex property, which is the page the user would like to browse to. Set the grid’s CurrentPageIndex property to e.NewPageIndex, then rebind the data.

·  What is the difference between login controls and Forms authentication?

Login controls are an easy way to implement Forms authentication without having to write any code. For example, the Login control performs the same functions you would normally perform when using the FormsAuthentication class—prompt for user credentials, validate them, and issue the authentication ticket—but with all the functionality wrapped in a control that you can just drag from the Toolbox in Visual Studio. Under the covers, the login control uses the FormsAuthentication class (for example, to issue the authentication ticket) and ASP.NET membership (to validate the user credentials). Naturally, you can still use Forms authentication yourself, and applications you have that currently use it will continue to run.

·  What is Tracing in ASP.NET ?

ASP.NET introduces new functionality that allows you to write debug statements, directly in your code, without having to remove them from your application when it is deployed to production servers. Called tracing, this feature allows you to write variables or structures in a page, assert whether a condition is met, or simply trace through the execution path of your page or application.

·  How do we enable tracing ?

Instead of enabling tracing for individual pages, you can enable it for your entire application. In that case, every page in your application displays trace information. Application tracing is useful when you are developing an application because you can easily enable it and disable it without editing individual pages. When your application is complete, you can turn off tracing for all pages at once.When you enable tracing for an application, ASP.NET collects trace information for each request to the application, up to the maximum number of requests you specify. The default number of requests is 10. You can view trace information with the trace viewer.By default, when the trace viewer reaches its request limit, the application stops storing trace requests. However, you can configure application-level tracing to always store the most recent tracing data, discarding the oldest data when the maximum number of requests is reached.To Enable Tracing for an application

1.Open your Web site’s Web.config file. If no Web.config file exists, create a new file in the root folder and copy the following into it:

2.Add a trace element as a child of the system.web element.

3.In the trace element, set the enabled attribute to true.

4.If you want trace information to appear at the end of the page that it is associated with, set the trace element’s pageOutput attribute to true. If you want tracing information to be displayed only in the trace viewer, set the pageOutput attribute to false.For example, the following application trace configuration collects trace information for up to 40 requests and allows browsers on computers other than the server of origin to display the trace viewer. Trace information is not displayed in individual pages.

·  What exactly happens when ASPX page is requested from Browser?

At its core, the ASP.NET execution engine compiles the page into a class, which derives from the code behind class (which in turn derives directly or indirectly from the Page class). Then it injects the newly created class into the execution environment, instantiates it, and executes it. ASP.NET, on the other hand, can accept code in any language that is compatible with the .NET framework, because it’s compiled down natively just like other code.

·  How do you deploy an ASP.NET application?

You can deploy an ASP.NET Web application using any one of the following three deployment options.1.XCOPY Deployment

2.Using the Copy Project option in VS .NET

3.Deployment using VS.NET installer

·  ASP.NET Configuration.

ASP.NET Configuration

The ASP.NET configuration system features an extensible infrastructure that enables you to define configuration settings at the time your ASP.NET applications are first deployed so that you can add or revise configuration settings at any time with minimal impact on operational Web applications and servers.

The ASP.NET configuration system provides the following benefits:

* Configuration information is stored in XML-based text files. You can use any standard text editor or XML parser to create and edit ASP.NET configuration files.

* Multiple configuration files, all named Web.config, can appear in multiple directories on an ASP.NET Web application server. Each Web.config file applies configuration settings to its own directory and all child directories below it. Configuration files in child directories can supply configuration information in addition to that inherited from parent directories, and the child directory configuration settings can override or modify settings defined in parent directories. The root configuration file named systemrootMicrosoft.NETFrameworkversionNumberCONFIGMachine.config provides ASP.NET configuration settings for the entire Web server.

* At run time, ASP.NET uses the configuration information provided by the Web.config files in a hierarchical virtual directory structure to compute a collection of configuration settings for each unique URL resource. The resulting configuration settings are then cached for all subsequent requests to a resource. Note that inheritance is defined by the incoming request path (the URL), not the file system paths to the resources on disk (the physical paths).

* ASP.NET detects changes to configuration files and automatically applies new configuration settings to Web resources affected by the changes. The server does not have to be rebooted for the changes to take effect. Hierarchical configuration settings are automatically recalculated and recached whenever a configuration file in the hierarchy is changed. The

section is an exception.

* The ASP.NET configuration system is extensible. You can define new configuration parameters and write configuration section handlers to process them.

* ASP.NET help protect configuration files from outside access by configuring Internet Information Services (IIS) to prevent direct browser access to configuration files. HTTP access error 403 (forbidden) is returned to any browser attempting to request a configuration file directly.

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asp.net interview questions Part-2

·  What are the different namespaces used in the project to connect the database? What data providers available in .net to connect to database ?

•    System.Data.OleDb – classes that make up the .NET Framework Data Provider for OLE DB-compatible data sources. These classes allow you to connect to an OLE DB data source, execute commands against the source, and read the results.
•    System.Data.SqlClient – classes that make up the .NET Framework Data Provider for SQL Server, which allows you to connect to SQL Server 7.0, execute commands, and read results. The System.Data.SqlClient namespace is similar to the System.Data.OleDb namespace, but is optimized for access to SQL Server 7.0 and later.
•    System.Data.Odbc - classes that make up the .NET Framework Data Provider for ODBC. These classes allow you to access ODBC data source in the managed space.
•    System.Data.OracleClient - classes that make up the .NET Framework Data Provider for Oracle. These classes allow you to access an Oracle data source in the managed space.

·  Difference between OLEDB Provider and SqlClient ?

SQLClient .NET classes are highly optimized for the .net / sqlserver combination and achieve optimal results. The SqlClient data provider is fast. It’s faster than the Oracle provider, and faster than accessing database via the OleDb layer. It’s faster because it accesses the native library (which automatically gives you better performance), and it was written with lots of help from the SQL Server team.

·  What are relation objects in dataset and how & where to use them ?

In a DataSet that contains multiple DataTable objects, you can use DataRelation objects to relate one table to another, to navigate through the tables, and to return child or parent rows from a related table.  Adding a DataRelation to a DataSet adds, by default, a UniqueConstraint to the parent table and a ForeignKeyConstraint to the child table.
The following code example creates a DataRelation using two DataTable objects in a DataSet. Each DataTable contains a column named CustID, which serves as a link between the two DataTable objects. The example adds a single DataRelation to the Relations collection of the DataSet. The first argument in the example specifies the name of the DataRelation being created. The second argument sets the parent DataColumn and the third argument sets the child DataColumn.
custDS.Relations.Add(”CustOrders”,
custDS.Tables[”Customers”].Columns[”CustID”],
custDS.Tables[”Orders”].Columns[”CustID”]);

OR

private void CreateRelation()
{
// Get the DataColumn objects from two DataTable objects in a DataSet.
DataColumn parentCol;
DataColumn childCol;
// Code to get the DataSet not shown here.
parentCol = DataSet1.Tables[”Customers”].Columns[”CustID”];
childCol = DataSet1.Tables[”Orders”].Columns[”CustID”];
// Create DataRelation.
DataRelation relCustOrder;
relCustOrder = new DataRelation(”CustomersOrders”, parentCol, childCol);
// Add the relation to the DataSet.
DataSet1.Relations.Add(relCustOrder);
}

·  How would u connect to database using .NET ?

SqlConnection nwindConn = new SqlConnection(”Data Source=localhost; Integrated Security=SSPI;” +
“Initial Catalog=northwind”);
nwindConn.Open();

·  Advantage of ADO.Net ?

o    ADO.NET Does Not Depend On Continuously Live Connections
o    Database Interactions Are Performed Using Data Commands
o    Data Can Be Cached in Datasets
o    Datasets Are Independent of Data Sources
o    Data Is Persisted as XML
o    Schemas Define Data Structures

·  What is the different between ASP.NET and VB.NET?

ASP.Net is an “environment”, and VB.Net is a programming language. You can write ASP.Net pages (called “Web Forms” by Microsoft) using VB.Net (or C#, or J# or Managed C++ or any one of a number of .Net compatible languages).

Confusingly, there is an IDE that Microsoft markets called VB.Net, which allows you to write and compile programs (WinForms, WebForms, class libraries etc) written in the language VB.Net

ASP.Net is simple a library that makes it easy for you to create web applications that run against the .NET runtime (similar to the java runtime).

VB.Net is a language that compiles against the common language runtime, like C#. Any .NET compliant language can use the asp.net libraries to create web applications.

Note : Actually there is not an IDE called VB.Net.  Microsoft’s IDE is called Visual Studio.Net which can be used to manage VB.Net, C#, Eiffle, Fortran, and other languages.

·  How can we create custom controls in ASP.NET?

Custom Controls can be created in either of the following 3 methods.

1. Creating as a composite control : This method uses and combines the existing controls to give a custom functionality which can be used across different projects by adding to the control library. This can provide for event bubbling from child controls to the Parent container, custom event handling and properties. The CreateChildControls function of the Control class should be overridden for creating this custom control. This can also support design time rendering of the control.

2. Deriving from an existing control : This method of creating a custom control derives from an existing ASP .Net control and customizing the properties that we need. This also can support custom event handling, properties etc.,

3. Creating a control from Scratch : This method is the one which needs maximum programming. This method needs even the HTML code for the custom controls to be written by the programmer. This may also need one to implement the IPostBackDataHandler and IPostBackEventHandler interfaces. A detailed explanation with example for this is available at Rendering Custom Controls Sample in MSDN.

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asp.net interview questions part-1

·  How many classes can a single .NET DLL contain ?

It can contain many classes.

  True or False: To test a Web service you must create a windows application or Web application to consume this service ?

False, the webservice comes with a test page and it provides HTTP-GET method to test.

  Which control would you use if you needed to make sure the values in two different controls matched ?

CompareValidator Control

  Which property on a Combo Box do you set with a column name, prior to setting the DataSource, to display data in the combo box ?

DataTextField property

  What does WSDL stand for ?

(Web Services Description Language)

  True or False: A Web service can only be written in .NET ?

False

  What tag do you use to add a hyperlink column to the DataGrid ?

  What tags do you need to add within the asp:datagrid tags to bind columns manually ?

Set AutoGenerateColumns Property to false on the datagrid tag

  What base class do all Web Forms inherit from ?

The Page class.

  What property must you set, and what method must you call in your code, in order to bind the data from some data source to the Repeater control ?

You must set the DataSource property and call the DataBind method.

  Which template must you provide, in order to display data in a Repeater control ?

ItemTemplate

  If I’m developing an application that must accommodate multiple security levels though secure login and my ASP.NET web application is spanned across three web-servers (using round-robin load balancing) what would be the best approach to maintain login-in state for the users ?

Maintain the login state security through a database.

  What does the “EnableViewState” property do? Why would I want it on or off ?

It enables the viewstate on the page. It allows the page to save the users input on a form.

  What data type does the RangeValidator control support ?

Integer,String and Date.

  Suppose you want a certain ASP.NET function executed on MouseOver overa certain button. Where do you add an event handler ?

It’s the Attributesproperty, the Add function inside that property. So btnSubmit.Attributes.Add(”onMouseOver”,”someClientCode();”)

  What’s a bubbled event ?

When you have a complex control, like DataGrid, writing an event processing routine for each object (cell, button, row, etc.) is quite tedious. The controls can bubble up their eventhandlers, allowing the main DataGrid event handler to take care of its constituents.

  What’s the difference between Codebehind=”MyCode.aspx.cs” andSrc=”MyCode.aspx.cs” ?

CodeBehind is relevant to Visual Studio.NET only.

  Where do you store the information about the user’s locale ?

System.Web.UI.Page.Culture

  Where does the Web page belong in the .NET Framework class hierarchy ?

System.Web.UI.Page

  What’s the difference between Response.Write() andResponse.Output.Write() ?

The latter one allows you to write formattedoutput.

  Describe the role of inetinfo.exe, aspnet_isapi.dll andaspnet_wp.exe in the page loading process ?

inetinfo.exe is theMicrosoft IIS server running, handling ASP.NET requests among other things.When an ASP.NET request is received (usually a file with .aspx extension),the ISAPI filter aspnet_isapi.dll takes care of it by passing the request tothe actual worker process aspnet_wp.exe.

  What is method to get XML and schema from Dataset ?           

getXML () and get Schema ()

  Differences between dataset.clone and dataset.copy ?

Clone - Copies the structure of the DataSet, including all DataTable schemas, relations, and constraints. Does not copy any data.
Copy - Copies both the structure and data for this DataSet.

  How to check if a datareader is closed or opened ?

IsClosed()

  In how many ways we can retrieve table records count? How to find the count of records in a dataset ?

foreach(DataTable thisTable in myDataSet.Tables){
// For each row, print the values of each column.
foreach(DataRow myRow in thisTable.Rows){

  What happens when we issue Dataset.ReadXml command ?

Reads XML schema and data into the DataSet.

  Explain different methods and Properties of DataReader which you have used in your project ?

Read
GetString
GetInt32
while (myReader.Read())
Console.WriteLine(” {0} {1}”, myReader.GetInt32(0), myReader.GetString(1));
myReader.Close();

  Difference between DataReader and DataAdapter / DataSet and DataAdapter?

You can use the ADO.NET DataReader to retrieve a read-only, forward-only stream of data from a database. Using the DataReader can increase application performance and reduce system overhead because only one row at a time is ever in memory.
After creating an instance of the Command object, you create a DataReader by calling Command.ExecuteReader to retrieve rows from a data source, as shown in the following example.
SqlDataReader myReader = myCommand.ExecuteReader();
You use the Read method of the DataReader object to obtain a row from the results of the query.
while (myReader.Read())
Console.WriteLine(” {0} {1}”, myReader.GetInt32(0), myReader.GetString(1));
myReader.Close();
The DataSet is a memory-resident representation of data that provides a consistent relational programming model regardless of the data source. It can be used with multiple and differing data sources, used with XML data, or used to manage data local to the application. The DataSet represents a complete set of data including related tables, constraints, and relationships among the tables. The methods and objects in a DataSet are consistent with those in the relational database model. The DataSet can also persist and reload its contents as XML and its schema as XML Schema definition language (XSD) schema.
The DataAdapter serves as a bridge between a DataSet and a data source for retrieving and saving data. The DataAdapter provides this bridge by mapping Fill, which changes the data in the DataSet to match the data in the data source, and Update, which changes the data in the data source to match the data in the DataSet. If you are connecting to a Microsoft SQL Server database, you can increase overall performance by using the SqlDataAdapter along with its associated SqlCommand and SqlConnection. For other OLE DB-supported databases, use the DataAdapter with its associated OleDbCommand and OleDbConnection objects.

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