private void DeleteBarItem_ItemClick(object sender, ItemClickEventArgs e) { if (diagnosis != null) { DialogResult dialogResult = XtraMessageBox.Show("You really want to delete the selected element?", "Sure", MessageBoxButtons.YesNo); if (dialogResult == DialogResult.Yes) { if (!_DB.DeleteDiagnosis(diagnosis)) { XtraMessageBox.Show("Element is not deleted!"); } ClearData(); _diagnosis = _DB.GetDiagnosis(); DiagnosisGridControl.DataSource = _diagnosis; } } else { XtraMessageBox.Show("Element is not selected!"); } }