主题：[求助]这个代码哪里错了，不为空时

If e.DataCol.Name =  "clxx_lphm" Then
    If e.DataRow("clxx_lphm") > "" Then
        e.DataRow("ajdjh") = Nothing
    Else
        Dim y As Integer = Date.Today.Year
        Dim qz As String = Tables("jgbmwh").Rows(0)("bmqz")
        Dim bh_temp As String = qz & "字[[]" & y & "[]]"
        Dim bh As String = qz & "字[" & y & "]"
        Dim  max As String
        Dim  idx As  Integer
        max = e.DataTable.Compute("Max(ajdjh)","ajdjh like '" & bh_temp & "%' And [_Identify] <> " & e.DataRow("_Identify"))
        If  max > "" Then '如果存在最大编号
            idx = CInt(max.Substring(bh.Length, 5)) + 1  '获得最大编号的后三位顺序号,并加1
        Else
            idx = 1 '否则顺序号等于1
        End  If
        e.DataRow("ajdjh") = bh & Format(idx,"00000") & "号"
    End  If
End If

我在clxx_lphm单元格不为空时自动编号

这个代码错在哪里，请大侠指教，谢谢

If e.DataRow("clxx_lphm") > "" Then

改成

If e.DataRow.IsNull("clxx_lphm") Then