Delete a record as ending a session - asp.net

Question

I want to delete a record from data base as a user close the browser. the record which i want to delete is belong to the user who close the browser or log out. I write this code in global but it doesn't work. Can any body help me.
Note: I want to delete the record that has username of log outed user.
thank you very much
the global code:
void Session_End(object sender, EventArgs e)
{
string connStr = ConfigurationManager.ConnectionStrings["dbconn"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(connStr);
SqlCommand sqlcmd = new SqlCommand("delete ChatRoomList where UserName=#UserName", sqlconn);
sqlcmd.Parameters.AddWithValue("#UserName", (string)Session["User"]);
sqlconn.Open();
sqlcmd.ExecuteNonQuery();
sqlconn.Close();
}

Answer 1

There is no reliable way to achieve this. Session_End event would only fire for in-process session state storage and the trigger point would be session expiration which is different than the browser close or user log-out.
So in your case, you may observe the event when your session actually gets timed out (if you have a logout link then you can force session expiry using Session.Abandon)
There are some other ways such as making an AJAX call to server to tell that user has logged out (or closing the browser window) and they may provide you with better results but again not 100% reliable. The most reliable way that I can think of is to have your own timer - i.e. to ping the server (using AJAX call) periodically from browser side and when pings are not received within certain time-out value, assume the user session to be dead/ended.

Answer 2

It will work on IE
window.onbeforeunload = function (event) {
if (((window.event.clientX || event.clientX) < 0) || ((window.event.clientY || event.clientY) < 0)) // close button
{
//call here you you jQuery function to delete either page method, web service or http
}
if ((window.event.clientX < 0) || (window.event.clientY < 0)) // close button
{
//call here you you jQuery function to delete either page method, web service or http
}
else if (window.event.altKey == true || window.event.ctrlKey == true) // ALT + F4
{
//call here you you jQuery function to delete either page method, web service or http handler
}
else // for all other unload events
{
}
}
});