Selected items in repeater control

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C#3.0

C#

protected void btnPDF_Click(object sender, EventArgs e)
        {

            DataTable _dtpdf = new DataTable();
            _dtpdf = (DataTable)(ViewState["TempData"]);
   
            DataTable _dtimport = new DataTable();
           
            try
            {
                string memberno = "1002,1003";
 
                DataRow[] rowsfound = _dtpdf.Select("MEMBERNO('" + memberno + "')");
                _dtpdf.Clear();
                foreach (DataRow item in rowsfound)
                {
                    _dtimport.ImportRow(item);
                }
                int j = _dtpdf.Rows.Count;
                Rpt_Company.DataSource = _dtpdf;
                Rpt_Company.DataBind();

            }
            catch (Exception ex)
            {
                throw ex;

            }

1.in the above coding i created a datatable
DataTable _dtpdf = new DataTable();
2. _dtpdf = (DataTable)(ViewState["TempData"]);
and assigned to the viewstate

3. string memberno = "1002,1003";
manually i am giving this 2 numbers in the source page and i am selecting only these 2 items in the repeater control
4. DataRow[] rowsfound = _dtpdf.Select("MEMBERNO('" + memberno + "')");


selected item should be stored in rowsfound ......but it is not happening.....PLease help me
i am getting object refernce not set to an instance of a object
PLease tell any the logic or correct my error