In general, what kind of salary could an average skilled C# developer make working at a mid-sized corporation or software developer company?

Not a consultant working on his/her own, but rather, just an employee of a corporation or a software solutions company...

Not a super-star hot-shot personality who could name his price...

Just an average skilled person with 10-15 years of varied software/language background, but one who is proficient and primaily works in C# and employed as described above.