Как я могу изменить задний цвет активной ячейки строки и столбца

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hi I'm new in vb and I want to change row and column backcolor for active cell but my code not work well 
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Что я уже пробовал:

Dim col_index As Byte
Dim row_index As Byte
Private Sub dgv1_CellEnter_1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgv1.CellEnter
    Try
        If dgv1.CurrentCell.ColumnIndex > 0 Then
            TextBox1.Text = dgv1.CurrentRow.Cells.Item("stu_sery").Value
            index = dgv1.CurrentRow.Index
            ComboBox1.SelectedIndex = dgv1.CurrentCell.ColumnIndex - 1
            dgv1.Columns(dgv1.CurrentCell.ColumnIndex).DefaultCellStyle.BackColor = Color.Aqua
            dgv1.Rows(dgv1.CurrentCell.RowIndex).DefaultCellStyle.BackColor = Color.Aqua
            dgv1.Columns(col_index).DefaultCellStyle.BackColor= Color.White
            dgv1.Rows(row_index).DefaultCellStyle.BackColor = Color.White

            row_index = dgv1.CurrentCell.RowIndex
            col_index = dgv1.CurrentCell.ColumnIndex
        End If
    Catch ex As Exception

    End Try
End Sub

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