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Response.BinaryWrite & CallbackPanel Options
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Ellery Gomez
Posted: Sunday, November 16, 2014 11:24:19 PM
Rank: Member
Groups: Member

Joined: 8/4/2009
Posts: 16
Hello,

I have a page with 2 callback panels and a toolbar, I use the following code to download a file stored in a SQL Server database:

Code: Visual Basic.NET 
Response.Clear()
Response.Buffer = True
Response.Charset = ""
Response.Cache.SetCacheability(HttpCacheability.NoCache)
Response.ContentType = lcDocType
Response.AppendHeader("Content-Disposition", "attachment; filename=" + lcDocName)
Response.BinaryWrite(bytes)
Response.Flush()
Response.End()


The problem is when I execute it from a toolbar button, when I call it from a normal button I'm able to download the file.

Is there something in the code that I will could change to make it works from the toolbar button?

Thanks in advance. Kind Regards
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eo_support
Posted: Monday, November 17, 2014 10:08:59 AM
Rank: Administration
Groups: Administration

Joined: 5/27/2007
Posts: 24,196
Hi,

Is the ToolBar button triggering a CallbackPanel callback? Or it's just a regular server post back?

Thanks!
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Ellery Gomez
Posted: Monday, November 17, 2014 3:07:00 PM
Rank: Member
Groups: Member

Joined: 8/4/2009
Posts: 16
Hello,

I forgot to say the Toolbar button is triggering a CallbackPanel callback.

Regards
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eo_support
Posted: Monday, November 17, 2014 3:09:40 PM
Rank: Administration
Groups: Administration

Joined: 5/27/2007
Posts: 24,196
Hi,

You can't download a file through Callback. Callback works by responding XML text data (so that the client code parse it and acts accordingly). This mutually exclusive with responding with binary file data. So a file download will not work through Callback.

Thanks!
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