使用Response.WriteFile下载.xls文件，下载包含网页内容的文件

I have a simple ASP.NET webpage using VB with a file upload control. The user will upload a .xls and a new .xls file is created in the project directory with a new format and some calculations. This file saves, opens, and displays without an issue. I have a simple ASP.NET webpage using VB with a