GitIgnore - Ignoring bin/ but including bin/*.refresh

Question

I'm trying to ignore the bin folder of a web project, but include the .refresh files that are in that bin folder.

Here's what I have in my .gitignore:

[Bb]in/
#Allow .refresh files for web sites
![Bb]in/*.refresh

But this isn't working. What am I doing wrong? I've also tried:

!*.refresh

With the same results.

Update:

Here's the file structure if that helps diagnose this:

\rootfolder
    .gitignore
    \project1
         \bin
              file1.dll
              file1.dll.refresh

You can see where our gitignore file is located. We don't want the .dll but we do want the .refresh file.

Answer 1

This way not worked for me:

[Bb]in/*
![Bb]in/*.refresh

I have used the syntax bellow on .gitignore file and worked fine.

Try it:

**/[Bb]in/*
!**/[Bb]in/*.refresh