'how to open a .pdf file in a panel or iframe using asp.net c#

I am trying to open a .pdf file on a button click. I want to open a .pdf file into a panel or some iframe. With the following code i can only open .pdf file in a separate window or in a save as mode. 

string filepath = Server.MapPath("News.pdf");
    FileInfo file = new FileInfo(filepath);
    if (file.Exists)
    {
        Response.ClearContent();            
        Response.AddHeader("Content-Disposition", "inline; filename=" + file.Name); 
        Response.AddHeader("Content-Length", file.Length.ToString());            
        Response.ContentType = ReturnExtension(file.Extension.ToLower());            
        Response.TransmitFile(file.FullName);
        Response.End();
    }

how to assign a iframe to the below line

Response.AddHeader("Content-Disposition", "inline; filename=" + file.Name);
c++sharpasp.net


Solution 1:[1]

I'm sorry, I can't answer your question directly (never heard of specifying a frame using a response header.)

What if, instead, you set the src of your iFrame to the page/url that writes the PDF to the client. That way the server only cares about sending back the data and the client is choosing where to display it.

Solution 2:[2]

In .aspx page 

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<asp:LinkButton ID="lnkBtnPDFViewer" runat="server" OnClick="lnkBtnPDFViewer_Click" ToolTip="View PDF Document" CssClass="btn btn-white btn-sm"><span class="fa fa-file-pdf-o"></span></asp:LinkButton>
 <asp:Button ID="btnDocShow" runat="server" CssClass="hidden" />
        <!-- ModalPopupExtender -->
        <cc1:ModalPopupExtender ID="mpeDocViewer" runat="server" PopupControlID="pnlDocViewer" TargetControlID="btnDocShow"
            CancelControlID="btnDocClose" />
        <asp:Panel ID="pnlDocViewer" runat="server" CssClass="ibox" Style="display: none;">
            <div class="ibox-title">
                <h5>Employee Doc Viewer</h5>
                <div class="ibox-tools">
                    <a class="close-link">
                        <i id="btnDocClose" class="fa fa-times"></i>
                    </a>
                </div>
            </div>
            <div class="ibox-content">
                <iframe src="#" id="iframePDFViewer" width="800" height="500"  runat="server"></iframe>
            </div>
        </asp:Panel>

In the respective server side code

protected void lnkBtnPDFViewer_Click(object sender, EventArgs e)
    {
        string filePath = Request.Url.Scheme + "://" + Request.Url.Authority + myfile.pdf;
        iframePDFViewer.Src = filePath;
        mpeDocViewer.Show();
    }

This will open the PDF file in a modal popup using iFrame.

Reference: Code Project: Asp .Net PDF Viewer

Solution 3:[3]

Code formated for the below

private void ReadPdfFile()
{
    string path = @"D:\Hemanth\sample.pdf";
    WebClient client = new WebClient();
    Byte[] buffer = client.DownloadData(path);
    if (buffer != null)
    {
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-length", buffer.Length.ToString());
        Response.BinaryWrite(buffer);
    }
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Kevin Buchan
Solution 2 Pranesh Janarthanan
Solution 3 Pranesh Janarthanan

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