Download Button to download from picture library - asp.net

Question

I have a ListView with a picture library as source and for each picture I have a asp:LinkButton that represents a download button. When pressed my button should open the browser download box. I'm using the following code to achieve that:
public void Download_Click(object source, EventArgs e)
{
LinkButton button = (LinkButton)source;
string url = Server.UrlEncode(button.CommandArgument);
FileInfo fileInfo = new FileInfo(url);
if (fileInfo.Exists)
{
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + fileInfo.Name);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.Flush();
Response.WriteFile(fileInfo.FullName);
}
else
{
//error
}
}
On that code I'm using Server.Encode("fileName") but I tried Server.Map and also used the "PicLibraryName/FileName" and "Application/PictureLibraryName/FileName" but I never get FileInfo.Exists true because I always get FileNotFoundException or System.Web.HttpException (when I use a virtual path).
Anyone knows what's the best way to solve this problem?

Answer 1

I think you should use WebClient.DownloadData(url) for downloading the file and then Response.OutputStream.Write method for output downloading data, also don't forget to end response using Response.End() something like this:
var wc=new System.Net.WebClient();
var data=wc.DownloadData(url);
Response.Clear();
//add headers..
Response.OutputStream.Write(data);
Response.End();