What is IsCallback in Asp .Net?

IsCallback is a property which return boolean value true and false.It is getting a value indicating whether the page request is the result of a callback. Its a special postback.Viewstate is not updated during a callback, it is for postback.

What is IsPostback in Asp .Net?

IsPostback is a property which return boolean value.It checks page postedback or not.If  boolean value is TRUE when page is first loaded. Thus, the first time that the page loads the IsPostBack flag is false and for subsequent PostBacks, it is true.

Difference between Html Controls and Asp .Net Controls

•  Asp .net controls run at server side and Html controls run at client side.
• Asp .net controls is used asp tag but Html controls do not use asp tag.
• Asp .net controls run on server side,execution is slow and  Html controls run on client side,execution is fast.
• Asp .net controls can be access aspx.cs page and Html controls can not be access aspx.cs page.
• Asp .net controls provide STATE management and Html control does not provide STATE management .

Why Use ASP.NET?

    Asp .Net is a open source web application framework and provide three layer architecture (DL,BL,PL).It is developed by Microsoft.It is used asp control and html control.It produce  dynamic website and static website and web services.Asp .Net have the extension .aspx.