visual studio - Why are there .sln, .suo and .csproj files?

Question

I began to use Visual Studio 2010. After I'm done with the C# program, I see that there are .sln, and .suo files in the project root directory, and a .csproj file in the subdirectory. What are those files for?

I need to identify the files to put into a Git repository. Together with the source code/documents that I create, I guess those three files are the only one that I have to take care of. However, I'm not sure if I'm tracking the correct files.

ADDED

How about the personal macro files? I have the Emacs key switch macro, does the .sln file or .csproj file have this macro?

Answer 1

You should commit the .sln and the .csproj, but not the .suo or the .user files.

You can add the following to .gitignore:

#ignore thumbnails created by windows
Thumbs.db
#Ignore files build by Visual Studio
*.obj
*.exe
*.pdb
*.user
*.aps
*.pch
*.vspscc
*_i.c
*_p.c
*.ncb
*.suo
*.tlb
*.tlh
*.bak
*.cache
*.ilk
*.log
[Bb]in
[Dd]ebug*/
*.lib
*.sbr
obj/
[Rr]elease*/
_ReSharper*/
[Tt]est[Rr]esult*