Hi to All... How to fill one dropdownlist from another dropdownlist selected change event in a datagrid in vb.net 1.1

Private Sub YourGrid_CellValueChanged(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles YourGrid.CellValueChanged
 
        If (e.ColumnIndex = -1 Or e.RowIndex = -1) Then
            Exit Sub
        End If
 
        If (TypeOf YourGrid.Item(e.ColumnIndex, e.RowIndex) Is DataGridViewComboBoxCell And YourGrid.Columns(e.ColumnIndex).Name.ToLower().Equals("YourColumn1")) Then
            Dim combotwo as DataGridViewComboBoxCell = DirectCast(YourGrid.Item("YourColumn2", e.RowIndex), DataGridViewComboBoxCell)
            combotwo.Items.Clear()
            'fill the data here
        End If
End Sub