redirect current page to download page in asp.net

I have problem when try auto download in another page that already been specify.

In current page, I have button to trigger to redirect page to download page, but I wish to download done automatic, even it don't done automatic. It can be done using link to download file. File name开发者_Go百科 wish to download, transfer using querystring, cookie, or session (I using cookie is this case).

The redirect page and download from link button, work perfect just like I wish. But the problem is auto download dont' work properly.

This what I already trying to do about problem auto download:

1. using if (!IsPostBack) condition. The download work, but the page don't redirect to download page and even that update progress keep running. (Actually i put update progress for purpose generate file before redirect and download).

2. using timer. When is not postback condition, I trying enable the timer with interval 2sec. When in timer event is trigger i disable timer and trying download it. But the problem is timer dont disable, keep every 2 sec to download file.

Regard.

You can either use Server.Execute("downloadpage.aspx"); to execute it using c# code. or use javascript timer like this:

function startdown() {
var url = "<%= DownloadPageurl %>";
setTimeout("window.location.href='" + url + "';", 5000);
}

and then call the function startdown() using c# or javascript according to your condition for download

or use below code for download

lass DownloadLibrary
{
public static string getContentType(string Fileext)
{
string contenttype = "";
switch (Fileext)
{
case ".xls":
contenttype = "application/vnd.ms-excel";
break;
case ".doc":
contenttype = "application/msword";
break;
case ".ppt":
contenttype = "application/vnd.ms-powerpoint";
break;
case ".pdf":
contenttype = "application/pdf";
break;
case ".jpg":
case ".jpeg":
contenttype = "image/jpeg";
break;
case ".gif":
contenttype = "image/gif";
break;
case ".ico":
contenttype = "image/vnd.microsoft.icon";
break;
case ".zip":
contenttype = "application/zip";
break;
default: contenttype = "";
break;
}
return contenttype;
}

public static void downloadFile(System.Web.UI.Page pg, string filepath)
{
pg.Response.AppendHeader("content-disposition", "attachment; filename=" + new FileInfo(filepath).Name);
pg.Response.ContentType = clsGeneral.getContentType(new FileInfo(filepath).Extension);
pg.Response.WriteFile(filepath);
pg.Response.End();
}
}

References:

http://dotnetacademy.blogspot.com/2010/09/timer-in-javascript.html

http://dotnetacademy.blogspot.com/2010/01/download-any-file-or-image-from.html

http://dotnetacademy.blogspot.com/2010/07/code-to-download-file-on-buttton-click.html