ASHX File Download Corrupted File

When ever I access my ashx eg download.ashx?id=18 it gets the file, but then when the save dialog pops up it wants me to save download.ashx rather than the file I have stored in the Database (lets say mypdf.pdf) If you open the file download it opens in Visual Studio and doesnt really show anything useful. What is causing this, I have tried it in many browsers and many machines and it all does the same?

Thanks

        string id = ctx.Request.QueryString["id"];
        string name = null;
        string mime = null;

        SqlConnection con = new SqlConnection(CONN);
        SqlCommand cmd = new SqlCommand("DownloadActivityFile", con);
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Parameters.AddWithValue("@aid", id);

        byte[] afile = null;
  开发者_StackOverflow中文版      try
        {
            con.Open();
            SqlDataReader reader = cmd.ExecuteReader();

            while (reader.Read())
            {
                mime = reader["ActivityFileMIME"].ToString();
                ctx.Response.ContentType = mime;
                afile = (byte[])reader["ActivityFile"];
                name = reader["ActivityFileName"].ToString();
            }
            ctx.Response.Buffer = false;
            ctx.Response.ContentType = mime;
            ctx.Response.AddHeader("content-disposition", string.Format("attachment; {0}", name));
            ctx.Response.Clear();
            ctx.Response.BinaryWrite(afile);
            ctx.Response.End();
        }
        catch (Exception e)
        {
            ctx.Response.Write(e.ToString());
        }
        finally
        {
            con.Close();
        }

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You need to set the Content-Disposition: attachment; filename=\"{0}\" header.
Note filename=, and the quotes around the name.