I have a asp web page with c# code ,i am trying to download an exe file but it download entire web page instead of exe plz help

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ASP

file

C#5.0

I have a asp web page with c# code ,i am trying to download an exe file but it download entire web page instead of exe plz help( i am starter)

my requirement : i want to download a exe file from my website using asp and c#

i am trying this code:

protected void btn_download_Click(object sender, EventArgs e)
    {
        string filename = "SherAcc.exe";
        if (filename != "")
        {
            string path = Server.MapPath(filename);
            System.IO.FileInfo file = new System.IO.FileInfo(path);
            if (file.Exists)
            {
                Response.Clear();
                Response.AddHeader("Content-Disposition", "attachment; SheraAcc=" + file.Name);
               
                Response.AddHeader("Content-Length", file.Length.ToString());

                Response.ContentType = "Application/octet-stream";
                Response.WriteFile(file.FullName);
                Response.End();
            }
            else
            {
                Response.Write("This file does not exist.");
            }
        }
    }

The output : downloading the page
note : exe file place in same location of the project no additional folder used