In my application, one query takes 3 minutes to execute. I found that Default ExecutionTimeout value is 110 sec.I tried to change this to 500 (seconds) but
To set timeout on a per page level, you could use this simple code:
Page.Server.ScriptTimeout = 60;
Note: 60 means 60 seconds, this time-out applies only if the debug attribute in the compilation element is False.