VB Winapp การ Check ค่าซ้ำใน datagridview แล้วลบค่าที่ซ้ำออกไป

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        For A As Integer = 0 To DataGridView2.Rows.Count - 1
            For B As Integer = A + 1 To DataGridView2.Rows.Count - 2
                If DataGridView2.Rows(A).Cells(1).Value = DataGridView2.Rows(B).Cells(1).Value Then
                    DataGridView2.Rows.RemoveAt(B)
                    A -= 1
                End If
            Next
        Next
End Sub