I do not agree with you. Yes 'nnnn' will prevent entering characters others than numeric but it will also entering more than 4 characters which is not perfectly aligned with the original question where he asked how to prevent entering other than numerics characters. But the keypress is in my view a good option because the integer style will also behaves like a mask which I think is not a good UX choice.

I believe that tells the grid to use an EditorWithMask with a numeric mask, which is pretty much what I suggested. Try typing letters in the cell; if disallows non-numeric characters, you'll know it works.

Thanks Brian.

How about using this below code?

    private void ultraGrid1_InitializeRow(object sender, InitializeRowEventArgs e)
        {
            if (e.Row.Index == 2)
                e.Row.Cells["My Column"].Style = Infragistics.Win.UltraWinGrid.ColumnStyle.Integer;
        }