I am getting the error "Thread was being aborted" on my following code

protected void btnSubmit_Click(object sender, EventArgs e)
       {


           try
           {


               User clsUser = null;

               if (this.Userid.Text == "")
               {

                   this.Userid.Focus();
                   throw new Exception("Please Enter User Name");

               }


               if (this.txtPssword.Text == "")
               {
                   this.txtPssword.Focus();
                   throw new Exception("Please Enter Password");
               }

               clsUser = m_SecuritySys.checkUser(this.Userid.Text, m_SecuritySys.EncrypyPassword(this.txtPssword.Text));

               if (clsUser != null)
               {

                   if (clsUser.intStatus == 2 || clsUser.intStatus == 3)
                   {

                   }
                   else
                   {
                       Session["userid"] = clsUser.strUserId;
                       Session["username"] = clsUser.strUserName;
                      // Session["userstream"] = clsUser.userStream;


                        Response.Redirect("~/Default.aspx",true);

                   }
               }
               else
               {
                   Userid.Focus();
                   throw new Exception("Invalid user entry, Please try again");
               }
           }
           catch (System.Threading.ThreadAbortException ex)
           {
               DisplayCustomMessage(ex.Message);
           }

           finally
           {
               if (connection != null)
                   connection.Dispose();
           }