主题：为什么有数据的也不显示了，关于for

For i As Integer = 1 To 7
    For j As Integer = 1 To 7
        Dim wtb As WinForm.TextBox = e.Form.Controls("Ts_" & i & "_" & j)
        If wtb.Text = "" Then
            wtb.Visible = False

        Else

            wtb.Visible = True
        End If
    Next