need ASAP.

here is the c# code:

 private void ProvideDownloadFile(string url)
        {
            byte[] imageData = null;
            string filename = "DataCardServerSetup.exe";

            using (var wc = new WebClient())
            {
                WebProxy proxy = WebProxy.GetDefaultProxy();
                wc.Proxy = proxy;
                imageData = wc.DownloadData(url);
            }

            using (Stream stream = new MemoryStream(imageData))
            {
                int bufferSize = 0;
                Response.Clear();
                Response.Buffer = true;
                Response.ClearHeaders();
                Response.CacheControl = "no-cache";
                Response.AddHeader("Pragma", "no-cache");
                Response.ClearContent();
                Response.AppendHeader("Content-Disposition:", "attachment; filename=\"" + filename + "\"");
                Response.AppendHeader("Content-Length", stream.Length.ToString());
                Response.ContentType = "application/octet-stream";
                byte[] byteBuffer = new byte[bufferSize + 1];
                MemoryStream memStrm = new MemoryStream(byteBuffer, true);

                while (stream.Read(byteBuffer, 0, byteBuffer.Length) > 0)
                {
                    Response.BinaryWrite(memStrm.ToArray());
                    Response.Flush();
                }

                Response.Close();
                Response.End();
                memStrm.Close();               
            }
        }

Can you provide a live site to reproduce the issue?
What's the content of the .aspx file downloaded by Google Chrome?

I cannot give live site details.

content of the download file is executable file ( .exe ) 

Thank you for providing more feedback. Adding requester "tkent@chromium.org" to the cc list and removing "Needs-Feedback" label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

The NextAction date has arrived: 2017-08-24

Will take a look.