How to trigger a postback using javascript in ASP.NET.
<script language='Javascript'> __doPostBack('__Page', 'MyCustomArgument'); </script>
or if you just want to receive the postback, you can send a null argument
<script language='Javascript'> __doPostBack('__Page', ''); </script>
It is supposedly correct. However, if you want to perform custom postback processing on the page, check out the IPostbackEventHandler interface.
http://msdn.microsoft.com/en-us/library/system.web.ui.ipostbackeventhandler.aspx