How to recognize a dead method function in your C# codes?

Question

How to recognize the dead functions / methods in your codes in C#?

 

I've created many libraries in the past and now it has become legacy. Most of the methods are completely unused and I don't want to go one by one and check every method and then remove it.

 

Is there any way that I can remove all the dead methods in one shot? 

 

Anyone?