Scan a table with NULL?

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VB

I have a table like this: (using DGV)

ID    Counter    Customer
1      NULL       3G001
2      NULL       3B002
3       1         3B003
4      NULL       3P004
5       2         3P005

and a code like this:

Dim x As Integer = 0
        While x <> DGVcheckq.RowCount

            If DGVcheckq.Rows(x).Cells(1).Value = "1" Then
                LBLq1.Text = DGVcheckq.Rows(x).Cells(2).Value
            ElseIf DGVcheckq.Rows(x).Cells(1).Value = "2" Then
                LBLq2.Text = DGVcheckq.Rows(x).Cells(2).Value
            End If
            x = x + 1
        End While

i wanna scan the table for customers that has a '1' or '2' Counter
but others are null so my code won't work. Can you guys give me another alternative code to scan a table with nulls?

Thanks in advance