private void submit_click(object sender, RoutedEventArgs e)
 {
     try
     {
         bool    match     = false;
         UsersBL p         = new UsersBL();
         string  login_txt = LoginId_txt.Text;
         string  pass_txt  = txt_Password.Password;
         match = p.AdminLogin(login_txt, pass_txt);
         if (match)
         {
             MessageBox.Show("Login Succesfull");
             AdminProgramOffered admin = new AdminProgramOffered();
             admin.Show();
             this.Close();
         }
         else
         {
             throw new UniversityException("Wrong Credentials");
         }
     }
     catch (UniversityException ex)
     {
         MessageBox.Show(ex.Message);
     }
 }
        private void back_click(object sender, RoutedEventArgs e)
        {
            AdminProgramOffered admin = new AdminProgramOffered();

            admin.Show();
            this.Close();
        }