Add iFrame in GridView using C# in ASP.Net

kats9993 says:

<asp:GridView ID="GridView1" Style="margin: auto" runat="server" AutoGenerateColumns="False"

       OnRowDataBound="GridView1_RowDataBound" BackColor="White" BorderColor="#CCCCCC"

       BorderStyle="None" BorderWidth="1px" Width="690px" CellPadding="4" ForeColor="Black"

       GridLines="Horizontal" >

       <Columns>

           <asp:BoundField DataField="PId_Num" Visible="false" />

           <asp:BoundField DataField="SrNo" Visible="false" />

           <asp:BoundField DataField="AcYear" Visible="false" />

           <asp:BoundField DataField="Comp_Code" Visible="false" />

           <asp:TemplateField ItemStyle-HorizontalAlign="Center" HeaderText = "Product's Certificates Details" >

               <ItemTemplate>

                   <asp:Literal ID="ltEmbed" runat="server" />

               </ItemTemplate>

               <ItemStyle HorizontalAlign="Center"></ItemStyle>

           </asp:TemplateField>

            

       </Columns>

       <FooterStyle BackColor="#CCCC99" ForeColor="Black" />

       <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White"  />

       <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />

       <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />

       <SortedAscendingCellStyle BackColor="#F7F7F7" />

       <SortedAscendingHeaderStyle BackColor="#4B4B4B" />

       <SortedDescendingCellStyle BackColor="#E5E5E5" />

       <SortedDescendingHeaderStyle BackColor="#242121" />

   </asp:GridView>

 replace above with below code

<asp:GridView ID="GridView1" Style="margin: auto" runat="server" AutoGenerateColumns="False"
    OnRowDataBound="GridView1_RowDataBound" BackColor="White" BorderColor="#CCCCCC"
    BorderStyle="None" BorderWidth="1px" Width="690px" CellPadding="4" ForeColor="Black"
    GridLines="Horizontal">
    <Columns>
        <asp:BoundField DataField="PId_Num" Visible="false" />
        <asp:BoundField DataField="SrNo" Visible="false" />
        <asp:BoundField DataField="AcYear" Visible="false" />
        <asp:BoundField DataField="Comp_Code" Visible="false" />
        <asp:TemplateField ItemStyle-HorizontalAlign="Center" HeaderText="Product's Certificates Details">
            <ItemTemplate>
                <iframe id="ifDisplayPdf" runat="server"></iframe>
            </ItemTemplate>
            <ItemStyle HorizontalAlign="Center"></ItemStyle>
        </asp:TemplateField>
    </Columns>
    <FooterStyle BackColor="#CCCC99" ForeColor="Black" />
    <HeaderStyle BackColor="#333333" Font-Bold="True" ForeColor="White" />
    <PagerStyle BackColor="White" ForeColor="Black" HorizontalAlign="Right" />
    <SelectedRowStyle BackColor="#CC3333" Font-Bold="True" ForeColor="White" />
    <SortedAscendingCellStyle BackColor="#F7F7F7" />
    <SortedAscendingHeaderStyle BackColor="#4B4B4B" />
    <SortedDescendingCellStyle BackColor="#E5E5E5" />
    <SortedDescendingHeaderStyle BackColor="#242121" />
</asp:GridView>

kats9993 says:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

    {

        if (e.Row.RowType == DataControlRowType.DataRow)

        {

            string

 

            embed = "<object data=\"{0}{1}\" type=\"application/pdf\" width=\"690px\" height=\"500px\">";  

            embed += "If you are unable to view file, you can download from <a href = \"{0}{1}&download=1\">here</a>";

            embed += " or download <a target = \"_blank\" href = \"http://get.adobe.com/reader/\">Adobe PDF Reader</a> to view the file.";

            embed += "</object>";

 

 

            System.Data.DataRowView DataRowView_1 = (System.Data.DataRowView)e.Row.DataItem;

 

            String PId_Num_String = Val.To_String(Val.To_Int(DataRowView_1["PId_Num"]));

            String SrNo_String = Val.To_String(Val.To_Int(DataRowView_1["SrNo"]));

            String AcYear_String = Val.To_String(Val.To_Int(DataRowView_1["AcYear"]));

            String Comp_Code_String = Val.To_String(Val.To_String(DataRowView_1["Comp_Code"]));

 

           (e.Row.FindControl("ltEmbed") as Literal).Text = string.Format(embed, ResolveUrl("~/File.ashx"), "?PN=" + PId_Num_String + "&SN=" + SrNo_String + "&AC=" + AcYear_String + "&CC=" + Comp_Code_String);

        }

    }

 replace above with below

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {           
        System.Data.DataRowView DataRowView_1 = (System.Data.DataRowView)e.Row.DataItem;

        String PId_Num_String = Val.To_String(Val.To_Int(DataRowView_1["PId_Num"]));
        String SrNo_String = Val.To_String(Val.To_Int(DataRowView_1["SrNo"]));
        String AcYear_String = Val.To_String(Val.To_Int(DataRowView_1["AcYear"]));
        String Comp_Code_String = Val.To_String(Val.To_String(DataRowView_1["Comp_Code"]));

        (e.Row.FindControl("ifDisplayPdf") as System.Web.UI.HtmlControls.HtmlControl).Attributes["src"] = ResolveUrl("~/File.ashx?PN=" + PId_Num_String + "&SN=" + SrNo_String + "&AC=" + AcYear_String + "&CC=" + Comp_Code_String);
    }
}