asked on

vb.net download file

I have this code behind for my asp.net page:

Protected Sub Download_Button_Click(sender As Object, e As System.EventArgs) Handles Download_Button.Click

Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.End()
Stop
End Sub

The file gets downloaded but why does Stop not get reached?

Nasir Razzaq

What do you want the Stop to do? Is that a keyword(never seen) or a function call?

Rick

Because of Response.End()

I don't think you need the 'Stop' anyway.

kperelman

ASKER

Actually I just wanted the code to stop. I set a break point at the stop function but it never gets there?

Nasir Razzaq

Why stop? It will stop any way at the End Sub. Or do you want to Pause? Why?

kperelman

ASKER

I have more code below but it never reaches it.

Nasir Razzaq

Show us the full code.

kperelman

ASKER

I have a site master with a default page with a button and this is the default page code behind.

Partial Class _Default
Inherits System.Web.UI.Page

Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click

Dim temp_value As Integer = 0

Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.End()

temp_value = temp_value + 1 '<-- this line has a breakpoint but the debugger does not stop here

End Sub
End Class

Nasir Razzaq

Have you enabled debugging in web.config?

kperelman

ASKER

Yes.

I can breakpoint at the line: Response.End()

Rick

Have you tried this?

With Response

.ContentType = "image/jpeg"
.AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
.TransmitFile(Server.MapPath("~/images/boat.jpg"))

temp_value = temp_value + 1

.End()

End

kperelman

ASKER

rick_gwu:

Sorry but because I need to donwload a 2nd file in the vb after the

temp_value = temp_value + 1

your work around will not be a good solution.

Nasir Razzaq

2nd file in the same code? That can not be seen in the full code that you posted.

Rick

I wasn't aware that you needed to download a second file... please explain what your requirements are in more detail.

If you're going to download n number of files, you could try something like this:

For i As Integer = 1 To n

   With Response
      .ContentType = "image/" & imgType
      .AppendHeader("Content-Disposition", "attachment; filename=" & img)
      .TransmitFile(Server.MapPath("~/images/" & img))
      .Clear()
   End With

   temp_value = temp_value + 1

Next

Response.End()

Open in new window

Rick

I meant,

For i as Integer = 0 to n

Rick

If you only have 2 files, try this:

With Response

   .ContentType = "image/jpeg"
   .AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
   .TransmitFile(Server.MapPath("~/images/boat.jpg"))
   .ClearHeaders()

   temp_value += 1

   .AppendHeader("Content-Disposition", "attachment; filename=jetski.jpg")
   .TransmitFile(Server.MapPath("~/images/jetski.jpg"))

   temp_value += 1

   .End()

End With

Open in new window

kperelman

ASKER

I tried this. I get prompted and can download boat1 but I am not prompted for boat2?

Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.Clear()
Response.AppendHeader("Content-Disposition", "attachment; filename=boat2.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.End()

SOLUTION

Nasir Razzaq

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Rick

Try .ClearHeaders()

Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.ClearHeaders()
Response.AppendHeader("Content-Disposition", "attachment; filename=boat2.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.End()

ASKER CERTIFIED SOLUTION

Rick

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

kperelman

ASKER

I copied your clearheaders() code but it did not work. Only the second file was created.

The code to download 2 files with a button click is what you have.

kperelman

ASKER

Here is all of the code:

site master page:
<%@ Master Language="VB" AutoEventWireup="false" CodeFile="Site.Master.vb" Inherits="Site" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head runat="server">
<title></title>
</head>
<body>
<form runat="server">
<div class="main">
<asp:ContentPlaceHolder ID="MainContent" runat="server"/>
</div>
</form>
</body>
</html>

default page:
<%@ Page Title="Home Page" Language="VB" MasterPageFile="~/Site.Master" AutoEventWireup="false"
CodeFile="Default.aspx.vb" Inherits="_Default" %>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<asp:Button ID="Button1" runat="server" Text="Button" />
</asp:Content>

default page code behind:

Imports System.IO
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=boat.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat.jpg"))
Response.ClearHeaders()
Response.AppendHeader("Content-Disposition", "attachment; filename=boat2.jpg")
Response.TransmitFile(Server.MapPath("~/images/boat2.jpg"))
Response.End()
End Sub
End Class

kperelman

ASKER

So does this code work for you?