What Are Some Examples of Well-Written C# Code?
I know C# isn't the most popular language for open source projects, but as a junior developer wanting to read C# in order to improve, where can I find some good projects to read?
Anyways, I suggest you use Visual Studio, use the code formatter, and stick to common good programming practices such as: using proper accessors (public, private, protected), don't duplicate code, name variables with style, document things that you think you'll be curious about later, and use git to keep track of your code.
Greenshot
Open Live Writer
System.Collections.Immutable
PerfView
If you want advice about how to use the framework then I would recommend Framework Design Guidelines.