A first chance exception of type 'System.Threading.ThreadAbortException' occurred in mscorlib.dll

Question

 

When click on Btn Cancel i get this exception even if i cath the exception

protected void BtnCancel_Click(object sender, EventArgs e)
    {
        try
        {
            Response.Redirect("Default.aspx", false);
        }
        catch (ThreadAbortException ex)
        {
            //do whatever you need to
        }
    }