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how to show popup when we close the browser

Posted By:      Posted Date: September 20, 2010    Points: 0   Category :.NET Framework
i want the wen i close the browser a popup should come confirm r u sure u 
want 2 exit if yes the browser should close and current date should be saved into the database.
i have tryied a code as
protected void Page_UnLoad(object sender, EventArgs e)

DateTime d = System.DateTime.Now;
string cn = "Data Source=hcl;Initial Catalog=mydata;Integrated Security=True";
SqlConnection con = new SqlConnection(cn);
SqlCommand cmd = new SqlCommand("insert into mydate values(@d)", con);
cmd.CommandType = CommandType.Text;
cmd.Parameters.Add(new SqlParameter("@d", d));
// cmd.Parameters.Add(new SqlParameter("@b", b));


but it was not succesful also before i close the browser the data is saved in the database.also i dont know how to call alert function 
as r u sure u want to exit .plz help

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