How to set UTF-8 Encoding for a file (Not UTF-8 BOM) in Response stream

Question

I am working with asp.net application with c#. I am trying let user download a file with an IIF extension to support QuickBooks integration.

Step 1: Save the file in web application domain path

After executing the above lines of code I opened the file using notepad++ and verified the encoding. it showed " Encode in UTF-8" checked

• The same saved file should be downloaded now from the application domain path.
• I have written the following logic to done the downloading file job
• Unfortunately after downloading the file from app domain path encoding got changed to UTF-8-BOM.
• I verified in Notepad++

The file encoding should be UTF-8 only. I have changed my code many times but still no luck.

• The Reason behind changing the UTF-8 is I need to feed this file to QuickBooks. Quick books is throwing exception if the encoding is UTF-8-BOM

• Links followed

• How to set UTF-8 encoding for a PHP file
• How to make sure my created filedownload is UTF-8? (and not UTF-8 without BOM)
• Response.Write - filename encoding wrong in Internet Explorer