Downloading from a grid

[Jed Fletcher]

I have got a button on the grid that when clicked sets a viewstate item to a file.
Now when i try use the response it gives me a error.
Now i have seen you can do it by

RadAjaxPanel1.ResponseScripts.Add(String.Format(@"window.location.href = ""{0}"";", http://yoursite.com/Your_File));

But how would one use this to do

response.binarywrite(byte[])

Please any help will be much appreciated. If this is in the incorrect section plese relocate.
Thanks

[Veli]

Hello Jed,

window.location.href is used for cases when you have your file stored in a directory on the web server. In your case, as you say, you have it loaded in memory on postback. So, you can do:

//attachment is the byte[] contaning the file data
//attachmentFileNameis the name of the file

CurrentHttpResponse.Clear();
CurrentHttpResponse.ContentType = "application/octet-stream";
CurrentHttpResponse.AddHeader("content-disposition", "attachment; filename=" + attachmentFileName);
CurrentHttpResponse.BinaryWrite(attachment);
CurrentHttpResponse.End();

Also, note that saving your files in the ViewState may not be very efficient. After all, the ViewState is serialized to the response page. It's like downloading your attachment on every page refresh.

Regards,
Veli
the Telerik team

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