private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            if (lstRole.SelectedIndex == -1)
                return;

            RoleHelper client = new RoleHelper();
            try
            {

                client.DeleteRoleTemplate(user, ((RoleTemplate)lstRole.SelectedItem).RoleTemplateID);

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                return;
            }
            finally
            {
                client.Close();
            }
            MessageBox.Show("Operation succeded!");
            loadRoles();
        }