ASP.NET can't download PDF using itext7 (but can save to disk)

Question

I'm using itext7 (7.1.16) to produce PDF. When i try to write to disk all is ok. When i'm trying to send back client (without saving on disk) nothing happens.

I associated this piece of code to Asp button but nothing happens (no errors and no goal). I've seen other thread where this piece of code has no problem. I can't understand where i put my hands.

protected void mtdCreatePDF(string TypeOutput, object sender, EventArgs e)
    {

        byte[] content = null;
        string suffix = @"Pdf_Produced\Print.pdf";
        string nameTGT = HttpContext.Current.Server.MapPath("~") + suffix;
        var stream = new MemoryStream();
        var writer = new PdfWriter(stream);
        var pdf = new PdfDocument(writer);
        var document = new Document(pdf);
        document.Add(new Paragraph("Hello world!"));
        document.Close();

        if (TypeOutput == "RESPONSE")
            {
              Response.Clear();
              Response.ClearContent();
              Response.ClearHeaders();
              Response.ContentType = "application/pdf";
              Response.AddHeader("content-disposition", "attachment;filename=print.pdf");
              Response.Cache.SetCacheability(HttpCacheability.NoCache);
             //writer.SetCloseStream(false);
              Response.BinaryWrite(stream.ToArray());
              Response.End();
             }
        else 
        {
            content = stream.ToArray();
            using (FileStream fs = File.Create(nameTGT))
            {
                fs.Write(content, 0, (int)content.Length);
            }
        }

    }

Thanks for time.

Answer 1

Solved, but issue is not itext7 (thanks so much to mkl because give a different reading key) but in the asp button.

Buttons are in update Panel and for first button developed i added a "postbacktriggers". Use the PostBackTrigger control to enable controls inside an UpdatePanel to cause a postback instead of performing an asynchronous postback. I've not added the button used for test in the Triggers. When added button download is ok.

 <asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
     <ContentTemplate>
         <asp:Panel ID="panelCMD" runat="server">
             <asp:LinkButton ID="btnFirstPDF_ResponseOutput" runat="server" CssClass="btn btn-small btn-primary fullwidth" OnClick="btnFirstPDF_ResponseOutput_Click"><i class="icon icon-ok"></i>PDF on Disk </asp:LinkButton>
             <asp:LinkButton ID="LinkButton1" runat="server" CssClass="btn btn-small btn-primary fullwidth" OnClick="LinkButton1_Click"><i class="icon icon-ok"></i>PDF Download</asp:LinkButton>
         </asp:Panel>
     </ContentTemplate>
     <Triggers >
        <asp:PostBackTrigger ControlID="btnFirstPDF_ResponseOutput"/>
        <asp:PostBackTrigger ControlID="LinkButton1"/>
     </Triggers>
 </asp:UpdatePanel>