private void DeleteBarItem_ItemClick(object sender, ItemClickEventArgs e) { if (nonworkingdays != null) { DialogResult dialogResult = XtraMessageBox.Show("You really want to delete the selected element?", "Sure", MessageBoxButtons.YesNo); if (dialogResult == DialogResult.Yes) { if (!_DB.DeleteNonWorkingDays(nonworkingdays)) { XtraMessageBox.Show("Element is not deleted!"); } _nonWorkingdays = _DB.GetNonWorkingDays(); NonWorkingDaysGridControl.DataSource = _nonWorkingdays; NamteTE.Text = string.Empty; DateMC.SelectionStart = DateTime.Now; } } else { XtraMessageBox.Show("Element is not selected!"); } }