IGNOU BCA MCA Students - VIVA Question Answer for .NET Part IV

IGNOU BCA MCA Students - VIVA Question Answer for .NET 

.NET with C# Selected Question Answer - PART IV

Ques 1) What is ASP.NET?

Ans)   ASP.NET is a specification developed by Microsoft to create dynamic Web applications, Web sites, and Web services. It is a part of .NET Framework. You can create ASP.NET applications in most of the .NET compatible languages, such as Visual Basic, C#, and J#. The ASP.NET compiles the Web pages and provides much better performance than scripting languages, such as VBScript. The Web Forms support to create powerful forms-based Web pages. You can use ASP.NET Web server controls to create interactive Web applications. With the help of Web server controls, you can easily create a Web application.

Ques 2) What is the basic difference between ASP and ASP.NET?

Ans)   The basic difference between ASP and ASP.NET is that ASP is interpreted; whereas, ASP.NET is compiled. This implies that since ASP uses VBScript; therefore, when an ASP page is executed, it is interpreted. On the other hand, ASP.NET uses .NET languages, such as C# and VB.NET, which are compiled to Microsoft Intermediate Language (MSIL).

Ques 3) In which event are the controls fully loaded?

Ans)   Page load event guarantees that all controls are fully loaded. Controls are also accessed in Page_Init events but you will see that view state is not fully loaded during this event.

Ques 4) How can we identify that the Page is Post Back?

Ans)   Page object has an "IsPostBack" property, which can be checked to know that is the page posted back.

IsPostBack

Postback is actually sending all the information from client to web server, then web server process all those contents and returns back to the client. Most of the time ASP control will cause a post back (e. g. buttonclick) but some don't unless you tell them to do In certain events ( Listbox Index Changed,RadioButton Checked etc..) in an ASP.NET page upon which a PostBack might be needed.

IsPostBack is a property of the Asp.Net page that tells whether or not the page is on its initial load or if a user has perform a button on your web page that has caused the page to post back to itself. The value of the Page.IsPostBack property will be set to true when the page is executing after a postback, and false otherwise. We can check the value of this property based on the value and we can populate the controls on the page.

Is Postback is normally used on page _load event to detect if the web page is getting generated due to postback requested by a control on the page or if the page is getting loaded for the first time.

C# Source Code

protected void Page_Load(object sender, EventArgs e)

{

    if (!IsPostBack)

    {

        // generate form;

    }

    else

    {

        //process submitted data;

    }

}