private void btn_SearchDevice_Click(object sender, EventArgs e) { DAL.DAL_Device devicedal = new DAL.DAL_Device(); DataTable _dt = devicedal.selectDeviceInfoWithPositionAndKey(this.txb_SearchDeviceKey.Text, cmb_DevicePosition.Text); if (_dt != null) { this.DeviceInfoGrid.DataSource = _dt; } }