Help with partial string search

I am using the code below to select rows in a Grid where values of SDeactivation is found agains SDéactivation_ID which is in Coumn(2). SDeactivation_ID contains single values.

When SDeactivation is a single value all is working of but when SDeactivation includes multiple values (i.e. 1,2,3) it does not work. How do i modify the code to select rows when using multiple values for SDeactivation?

MsgBox("keySDeactivation)" & keySDeactivation)
        '  keySDeactivation = "1,2" does not works
        '  keySDeactivation = "1" works
        If keySDeactivation <> "" Then
            Dim _tableA As DataView = dtMasterA.DefaultView
                  C1SDeactivation.DataSource = _tableA
                    For i As Integer = 0 To C1SDeactivation.RowCount - 1
                If C1SDeactivation.Columns(2).CellValue(i).ToString().Contains(keySDeactivation) = True Then
                    C1SDeactivation.SelectedRows.Add(i)
                End If
            Next
        End If


Thanks,

Victor