private void btnDelete_Click(object sender, RoutedEventArgs e)
 {
     if (lstProgram.SelectedIndex == -1)
         return;
     ProgrammeHelper client = new ProgrammeHelper();
     try
     {
         client.DeleteProgram(user, ((Program)lstProgram.SelectedItem).ProgramID);
         MessageBox.Show("Operation succeeded!");
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
     finally
     {
         client.Close();
     }
     loadPrograms();
 }