Is there a simple way to allow only whole numbers in datagridview

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VB

validation

DataGridView

Hello, I'm trying to find a simple way to prevent fractional or decimal numbers in my datagridview. All I want to do is show a simple messagebox that tells the user that only whole numbers are allowed. Here is what I have so far.

If (e.ColumnIndex = 1) Then 'This will specify which column 
            Dim cellData = DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value
            If cellData Is NotWholeNum Then 'I don't know how to prevent non-whole numbers
                MessageBox.Show("Only Whole Numbers Allowed")
                DataGridView1.Rows(e.RowIndex).Cells(e.ColumnIndex).Value = "DefaultValue" 'This will supply a default value back to the datagridviewcell

                Exit Sub

            End If