I Am Getting Empty One Column When Convert Gridview To Pdf If I Use Template Field

Hi, I am facing issue empty on templateField when i convert gridview to pdf.

I am binding grid view from databae using sqlcommand.

cmd.CommandText = "select orderno, shname,totalnum2,orderType from tabelname where reforderno is not null";
GridView1.DataSource = ds;
GridView1.DataBind();


aspx page:


<asp:GridView ID="GridView1" runat="server"
AutoGenerateColumns = "false" Font-Names = "Arial"
Font-Size = "11pt" AlternatingRowStyle-BackColor = "#C2D69B"
HeaderStyle-BackColor = "green" AllowPaging ="true"
OnPageIndexChanging = "OnPaging" >
<Columns>

<asp:TemplateField HeaderText="Order#" HeaderStyle-Font-Bold="false" HeaderStyle-Width="57">
<ItemTemplate>
<asp:LinkButton ID="lnkallorder" ForeColor="#4b4b4b" runat="server" OnClientClick="aspnetForm.target ='_blank';" Text='<%# DataBinder.Eval(Container.DataItem,"orderno") %>' CommandName="all" OnClick="orderno_clicked"></asp:LinkButton>
</ItemTemplate><ItemStyle Width="57" />
</asp:TemplateField>

<asp:BoundField ItemStyle-Width = "200px" DataField = "shname" HeaderText = "CustomerID" />
<asp:BoundField ItemStyle-Width = "100px" DataField = "totalnum2" HeaderText = "City"/>
<asp:BoundField ItemStyle-Width = "50px" DataField = "orderType" HeaderText = "Country"/>
</Columns>
</asp:GridView>

<asp:Button ID="btnExportPDF" runat="server" Text="ExportToPDF" OnClick="btnExportPDF_Click" />

Now i have output follow

Order#  CustomerID       City  Country
111         aaaa1          2        Y
222         bbbb2          3        Y
333         cccc3          4        N

ExportToPDF // this is button click event which generates gridview to pdf.

coding for gridview to pdf
aspx.cs page
protected void btnExportPDF_Click(object sender, EventArgs e)
{

//Create a table
iTextSharp.text.Table table = new iTextSharp.text.Table(GridView1.Columns.Count);
table.Cellpadding = 5;

//Set the column widths
int[] widths = new int[GridView1.Columns.Count];
for (int x = 0; x < GridView1.Columns.Count; x++)
{
widths[x] = (int)GridView1.Columns[x].ItemStyle.Width.Value ;
string cellText = Server.HtmlDecode(GridView1.HeaderRow.Cells[x].Text);
iTextSharp.text.Cell cell = new iTextSharp.text.Cell(cellText);
cell.BackgroundColor = new Color (System.Drawing.ColorTranslator.FromHtml("#008000"));
table.AddCell(cell);
}
table.SetWidths(widths);

//Transfer rows from GridView to table
for (int i = 0; i < GridView1.Rows.Count; i++)
{
if (GridView1.Rows[i].RowType == DataControlRowType.DataRow)
{
for (int j = 0; j < GridView1.Columns.Count; j++)
{
string cellText = Server.HtmlDecode(GridView1.Rows[i].Cells[j].Text);
iTextSharp.text.Cell cell = new iTextSharp.text.Cell(cellText);

//Set Color of Alternating row
if (i % 2 != 0)
{
cell.BackgroundColor = new Color(System.Drawing.ColorTranslator.FromHtml("#C2D69B"));
}
table.AddCell(cell);
}
}
}

//Create the PDF Document
Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
pdfDoc.Open();
pdfDoc.Add(table);
pdfDoc.Close();
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.pdf");
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Write(pdfDoc);
Response.End();
}

But now i am getting result in pdf follow

Order#      CustomerID        City   Country
                aaaa1           2     Y
                bbbb2           3     Y
                cccc3           4     N

The Order# is getting "" empty as i used template field. if i use databound i am getting all column without empty. But i need show link on gridview for orderno.

Why i am getting empty if i use tempate field. how to solve this problem.

Help needed.

Thanks