Want to do some action while closing the window

Hi, I am sabareeswaren currently doing a project. i am doing the project in asp.net using c#. could any one tell me how to do some action(Update the database) while closing the window? Its very urgent, so please any one help me..... Thanks in Advance!!!!! Sabareeswaren.

Hi, The following code is for getting the textbox value while closing the window window.onbeforeunload = function() { if((window.event.clientX<0) || (window.event.clientY<0)) { onBeforeUnloadAction(); } } function onBeforeUnloadAction() { var textValue; textValue=document.getElementById(''TextBox'').value; alert("Text Value : "+textValue); } Thanx