Visual Studio
Tools -> Options
Text Editor -> C# -> Tabs
Settings:
Indenting: Smart
Tab size: 4
Indent size: 4
Keep tabs CHECKED
Notepad++
Tools -> Preferences
Language -> C#
Settings:
[Default]
Tab size: 4
Replace by space UNCHECKED
Visual Studio
Tools -> Options
Text Editor -> C# -> Tabs
Settings:
Indenting: Smart
Tab size: 4
Indent size: 4
Keep tabs CHECKED
Notepad++
Tools -> Preferences
Language -> C#
Settings:
[Default]
Tab size: 4
Replace by space UNCHECKED