Error: Download a file from directory using ASP.NET

Question

I'm trying to download a file which has been stored in my HDD. Now i'm tried to use this block of code, and these code are used in button click event. But the problem is when i'm click the button it download my form(in my case "DAO.aspx") instead of the file (SampleFile.xlsx);

    protected void BtnDownload_Click(object sender, EventArgs e)
    {
        try
        {                
            Response.Clear();
            Response.ContentType = "application/octect-stream";
            Response.AppendHeader("content-disp­osition", "attachment; filename=SampleFile.xlsx");
            Response.TransmitFile(Server.MapPath("~/SampleExcel/SampleFile.xlsx"));
            Response.End();

        }
        catch (Exception ex)
        {               
            MessageBox.Show(ex.Message);
        }

    }

Answer 1

Try this:

Response.ClearHeaders();
Response.ClearContent();
Response.ContentType = "Application/octect-stream";
Response.AppendHeader("Content-disposition", "attachment; filename=SampleFile.xlsx");
Response.WriteFile(Server.MapPath("~/SampleExcel/SampleFile.xlsx"));