DataGridViewのセル値によってセルスタイルを変更する方法

DataGridViewのセル値によってセルスタイルを変更する方法
VB.NET

Private Sub dgv1_CellFormatting(ByVal sender As Object, _
        ByVal e As DataGridViewCellFormattingEventArgs) _
        Handles dgv1.CellFormatting
    Dim dgv As DataGridView = CType(sender, DataGridView)

    If dgv.Columns(e.ColumnIndex).Name = "Column1" AndAlso _
            TypeOf e.Value Is Integer Then
        Dim val As Integer = CInt(e.Value)
        If val < 0 Then
            e.CellStyle.BackColor = Color.Yellow
        Else If val = 0 Then
            e.CellStyle.BackColor = Color.Red
        End If
    End If
End Sub

C#

private void dgv1_CellFormatting(object sender,
    DataGridViewCellFormattingEventArgs e)
{
    DataGridView dgv = (DataGridView)sender;

    if (dgv.Columns[e.ColumnIndex].Name == "Column1" && e.Value is int)
    {
        int val = (int)e.Value;
        if (val < 0)
        {
            e.CellStyle.BackColor = Color.Yellow;
        }
        else if (val == 0)
        {
            e.CellStyle.BackColor = Color.Red;
        }
    }
}