从网格视图访问数据以下载 asp.net 格式的 PDF 文档

     FID            NAME    
     M001           Faculty1    download
     M002           Faculty2    download
     M003           Faculty3    download

上面显示的是我的网格视图，其中包含教师的详细信息，下载链接指示要下载的教师的 pdf 表格。

       va = (string)Session["FID"];


       protected void DownloadFile(object sender, EventArgs e)
{
    DataRow dr = GetData("select * from Personal_det where FID ='"+va+"'").Rows[0];
    Document doc = new Document(PageSize.A4, 88f, 88f, 10f, 10f);
    Font NormalFont = FontFactory.GetFont("Arial", 12, Font.NORMAL, BaseColor.BLACK);
    using (System.IO.MemoryStream m = new System.IO.MemoryStream())
    {
        PdfWriter w = PdfWriter.GetInstance(doc, m);
        Phrase phrase = null;
        PdfPCell cell = null;
        PdfPTable table = null;
        BaseColor color = null;
        Paragraph para = null;
        Font times = null;
        BaseFont bfTimes = null;

        doc.Open();
        table = new PdfPTable(2);
        cell = PhraseCell(new Phrase("Faculty Profile", FontFactory.GetFont("Arial", 12, Font.UNDERLINE, BaseColor.BLACK)), PdfPCell.ALIGN_CENTER);
        //table.SpacingBefore = 20f;
        cell.Colspan = 2;
        table.AddCell(cell);
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 30f;

        //FID
        table.AddCell(PhraseCell(new Phrase("Faculty Code:", FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        table.AddCell(PhraseCell(new Phrase("mahe" + dr["FID"].ToString(), FontFactory.GetFont("Arial", 8, Font.NORMAL, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 10f;
        table.AddCell(cell);
        //Name
        table.AddCell(PhraseCell(new Phrase("Name:", FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        table.AddCell(PhraseCell(new Phrase(dr["Name"].ToString(), FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 10f;
        table.AddCell(cell);

        //Date of Birth
        table.AddCell(PhraseCell(new Phrase("Date of Birth:", FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        table.AddCell(PhraseCell(new Phrase(Convert.ToDateTime(dr["DOB"]).ToString("dd MMMM, yyyy"), FontFactory.GetFont("Arial", 8, Font.NORMAL, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 10f;
        table.AddCell(cell);
        //Phone Number
        table.AddCell(PhraseCell(new Phrase("Phone Number:", FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        table.AddCell(PhraseCell(new Phrase(Convert.ToInt64(dr["MobileNo"]).ToString(), FontFactory.GetFont("Arial", 8, Font.NORMAL, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 10f;
        table.AddCell(cell);
        //Mail Id
        table.AddCell(PhraseCell(new Phrase("Email ID:", FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        table.AddCell(PhraseCell(new Phrase(dr["EmailId"].ToString(), FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 10f;
        table.AddCell(cell);
        //Address
        table.AddCell(PhraseCell(new Phrase("Res Address:", FontFactory.GetFont("Arial", 8, Font.BOLD, BaseColor.BLACK)), PdfPCell.ALIGN_LEFT));
        phrase = new Phrase(new Chunk(dr["add1"] + "'n " + dr["add2"] + "'n " + dr["add3"] + "'n " + dr["Pincode"], FontFactory.GetFont("Arial", 8, Font.NORMAL, BaseColor.BLACK)));
        table.AddCell(PhraseCell(phrase, PdfPCell.ALIGN_LEFT));
        cell = PhraseCell(new Phrase(), PdfPCell.ALIGN_CENTER);
        cell.Colspan = 2;
        cell.PaddingBottom = 10f;
        table.AddCell(cell);
        table.SpacingAfter = 30f;
        doc.Add(table);
 }

我的网格视图代码如下所示

           <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        DataSourceID="SqlDataSource1" 
         Width="294px" onselectedindexchanged="GridView1_SelectedIndexChanged"  
         >
        <Columns>
            <asp:BoundField DataField="FID" HeaderText="FID" SortExpression="FID" />
            <asp:BoundField DataField="Name" HeaderText="Name" SortExpression="Name" />
           <asp:TemplateField ItemStyle-HorizontalAlign="Center">
                <ItemTemplate>
                    <asp:LinkButton ID="lnkDownload" runat="server" 
      CommandArgument="&lt;(&quot;Value&quot;)&gt;" OnClick="DownloadFile"
                        Text="Download" />
                </ItemTemplate>
            </asp:TemplateField>


        </Columns>
    </asp:GridView>
    <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
        ConnectionString="<%$ ConnectionStrings:ProjectConnectionString %>" 
        SelectCommand="SELECT [FID], [Name] FROM [Personal_det]">
    </asp:SqlDataSource>

问题是，当我单击下载按钮时，即使

我单击其他教师的下载按钮，第一教师的PDF也一直在显示，我需要获取每个教师的数据如何获取pdf？

我的要求是，应该为特定的 FID 下载狭隘的 pdf，而不应该只为第一个 FID 下载。

<asp:LinkButton ID="lnkDownload" runat="server" 
  CommandArgument='<%#Eval("FID")%>' CommandName="DownloadFile" OnClick="DownloadFile" Text="Download" />

 protected void DownloadFile(object sender, EventArgs e)
  {
  string FID = Convert.ToString(((LinkButton)sender).CommandArgument); 
 DataRow dr = GetData("select * from Personal_det where FID = '"+ FID +"'").Rows[0];
  .....
  //other codes
  }