When clicking the linkbutton(download) and I click the other button is still downloading the file

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C#

ASP.NET

Hi guys im having problem on my codes, after i upload the and download it. It downloads the file but after that i click the other button is still download the file. Can you help me please. and here's my codes

What I have tried:

This is my code to view the file.
if (lblFile.Text != "")
{
trAttachedFile.Visible = true;
lbtnDownload.PostBackUrl = "~/Download.aspx?file=" + lblFile.Text;
}
else
{
trAttachedFile.Visible = false;
}


And here's my code to download the file(Download.aspx)

private bool StartDownload()
{
if (DownloadID != "")
{
string downloadPath = WebConfigurationManager.AppSettings["SubPic"].ToString() + DownloadID;
FileInfo downloadFile = new FileInfo(downloadPath);

if (downloadFile.Exists)
{
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + downloadFile.Name);
Response.AddHeader("Content-Length", downloadFile.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.WriteFile(downloadFile.FullName);
Response.End();
return true;
}
}
return false;
}