Why ASP page created gridview control gone?

Hi,

    It suddenly come to me the gridview control missing on the page, while I nearly changed nothing.

My code to create gridview is as below:


                    GridView[] gv = new GridView[arraySN.Count];
                    DataTable[] tblMeas = new DataTable[arraySN.Count];
                    Label[] lblMeas = new Label[arraySN.Count];

                    for (int i = 0; i < arraySN.Count; i++)
                    {
    ...