Hi Julie,
You can handle the CurrentCellErrorMessage event of grid, which you can display your own custom message box whenever the grids CurrentCell.DisplayWarningText (as a result of some kind of validation error) is called.
Please refer the attached sample for the implementation.
InvalidDatatype.zipprivate void gridDataBoundGrid1_CurrentCellErrorMessage(object sender, Syncfusion.Windows.Forms.Grid.GridCurrentCellErrorMessageEventArgs e)
{
MessageBox.Show(e.Text,"NewError",MessageBoxButtons.OKCancel );
e.Cancel = true;
}
Best regards,
Haneef