>Thanks Paul,
>
> Which section in web.config should I change the value. In Sessionstate I changed from 20 to 200 and also I copied and pasted the code you wrote in the html but it still does not work. Do I have to put my server name in place of Server word.

No, Server is correct.

Here's where you'd change it in the web.config

<system.web>
  <httpModules>
  </httpModules>

  <compilation>
    <assemblies>
    </assemblies>
  </compilation>

  <httpRuntime maxRequestLength="1048576" executionTimeout="180" />

If that doesn't fix it, it could be the timeout on the SQL connection object (CommandTimeout).