ChangingResponse type at server side on click of button which is in updatepanel

ASPX Code :

< asp:ScriptManager ID="scManager" runat="server">< /asp:ScriptManager>

< asp:UpdatePanel ID="aaa" runat="server" UpdateMode="Conditional">

< ContentTemplate>

< asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Downlaod" />

< /ContentTemplate>

< Triggers>

< /Triggers>

< /asp:UpdatePanel>

Page Load Event :

string strScriptKey = this.ClientID + "_AsposeDownload";

if (!this.Page.ClientScript.IsClientScriptBlockRegistered(strScriptKey))

{

string strScriptBlock = "";

this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), strScriptKey, strScriptBlock);

}

JS Code :

function blockUIForDownload() {

Download();

}

function Download() {

try {

location.href = "Handler1.ashx";

//finishDownload();

}

catch (err) {

}

return false; // Return false to stop the page posting back

}

Global Handler with the following code:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using Aspose.Slides.Pptx;

namespace WebApplication1

{

///

/// Summary description for Handler1

///

public class Handler1 : IHttpHandler

{

public void ProcessRequest(HttpContext context)

{

PresentationEx pres = new PresentationEx();

SlideEx slide = pres.Slides[0];

slide.Shapes.AddAutoShape(ShapeTypeEx.Rectangle, 0, 0, 500, 100);

slide.Shapes.AddAutoShape(ShapeTypeEx.Rectangle, 0, 305, 500, 100);

TextFrameEx tf1 = ((AutoShapeEx)slide.Shapes[0]).TextFrame;

TextFrameEx tf2 = ((AutoShapeEx)slide.Shapes[1]).TextFrame;

for (int i = 0; i < 500; i++)

{

tf1.Text += "\r\rQa will continue &amp; testing for al formatting issue\r\r";

tf2.Text += "";

}

ParagraphEx para1 = tf1.Paragraphs[0];

ParagraphEx para2 = tf2.Paragraphs[0];

para2.BulletType = BulletTypeEx.Numbered;

ParagraphEx para3 = new ParagraphEx();

para3.BulletType = BulletTypeEx.Numbered;

para3.Indent = 144;

para3.Alignment = TextAlignmentEx.Center;

para3.Text = "";

tf2.Paragraphs.Add(para3);

para1.MarginLeft = 72;

para2.Indent = 144;

float Par1Margin = para1.MarginLeft;

string strHttpResCT = "application/vnd.ms-powerpoint";

string strHttpHdrCD = "attachment; filename=PowerPointFile.pptx";

Aspose.Slides.Export.SaveFormat sfOutputFormat = Aspose.Slides.Export.SaveFormat.Pptx;

HttpContext.Current.Response.ContentType = strHttpResCT;

HttpContext.Current.Response.AddHeader("Content-Disposition", strHttpHdrCD);

pres.Save(HttpContext.Current.Response.OutputStream, sfOutputFormat);

HttpContext.Current.Response.Flush();

}

public bool IsReusable

{

get

{

return false;

}

}

}

}