Question

public class Sample{

  private const ="constant string";

  public static object StaticMethod(args){

    var result= SomeOtherClass.StaticMethod(const,args);

    return result;

  }

}

will this code be thread safe?

Answer 1

Constants are thread safe by every means, As they are compiled into to their real values during compile time and their values never change during execution of program regardless of how many threads are accessing it 🙂

Once you will compile the code compiler will replace all references of const variable with constant’s real value in your case it is “Constant String”
hence it will never change in its life time. until you change the value of constant variable it self and recompile the code.

I gave reference from Eric Lippert as he is a principal developer on the C# compiler team.

From Eric’s blog

One of the much-touted benefits of immutable data structures is that
they are “threadsafe”. Since they cannot be written to, you’ll never
run into a situation where a write operation is interrupted halfway by
a thread switch, causing another thread to read an inconsistent data
structure. However, it is a fallacy to believe that just because a
data structure does not admit any way for you change its contents, its
implementation must be threadsafe!