Disabling Button On Click

Sometimes you need to avoid multiple submission by clicking the a button multiple times to avoid that add the following javascript code to your page or script file:

function Button_Clicked(btn) {
   if (typeof(Page_ClientValidate) == 'function') {
       if (Page_ClientValidate() == false) { return false; }
       }
   btn.value = 'Please Waite...';
   btn.disabled = true;
   __doPostBack(btn.name, "");
   WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions(btn.name, "", true, "", "", false, false))

}

Add the code function name to onclientclick property.