You may save a lot of coding by maintaining the ViewState of the objects in your Web Form.
When a form is submitted in classic ASP, all form values are cleared. Suppose you have submitted
a form with a lot of information and the server comes back with an error. You will have to go
back to the form and correct the information. You click the back button, and what
happens.......ALL form values are CLEARED, and you will have to start all over again! The site
did not maintain your ViewState.
When a form is submitted in ASP .NET, the form reappears in the browser window together with all
form values. How come? This is because ASP .NET maintains your ViewState. The ViewState
indicates the status of the page when submitted to the server. The status is defined through a
hidden field placed on each page with a <form runat="server"> control. The
source could look something like this:
Maintaining the ViewState is the default setting for ASP.NET Web Forms. If you want to NOT
maintain the ViewState, include the directive <%@ Page EnableViewState="false" %>
at the top of an .htmlx page or add the attribute EnableViewState="false" to any
Look at the following .htmlx file. It demonstrates the "old" way to do it. When you
click on the submit button, the form value will disappear:
Here is the new ASP .NET way. When you click on the submit button, the form value will NOT
Click view source in the right frame of the example to see that ASP .NET has added a
hidden field in the form to maintain the ViewState
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