Constructor overload contains already defines a member with the same signature

Question

public Module(string a, object obj) : this(a, null, obj) { }

public Module(string b, object obj) : this(null, b, obj) { }

These constructor overloads

Answer 1

Parameter names are meaningless in the context of overloads. I can see what you are trying to do, but I'm not sure why. I would dispense with it entirely:

public Module(string a, string b, object obj){}

Then call the Module constructor, passing in null values as appropriate.

Module m = new Module(null, "hi", obj);

Module m2 = new Module("bye", null, obj);