private void btnUserDeleteRow_Click(object sender, EventArgs e)
 {
     if (usersGrid.SelectedRows[0] != null)
     {
         if (_selectedUser != null)
         {
             DialogResult dialogResult = MessageBox.Show(string.Format("Are you sure you want to delete the user {0}", _selectedUser.Name), "Delete approval", MessageBoxButtons.YesNo);
             if (dialogResult == System.Windows.Forms.DialogResult.Yes)
             {
                 try
                 {
                     _usersGroupsDataLayer.DeleteUser(_selectedUser);
                     _users.Remove(_selectedUser);
                     usersGrid.DataSource = _users;
                     usersGrid.Refresh();
                     MessageBox.Show("User Deleted!");
                 }
                 catch (Exception ex)
                 {
                     MessageBox.Show(ex.Message);
                 }
             }
         }
     }
 }