C# 3.5 Optional and DefaultValue for parameters

Question

I am using C# .net 3.5 to build an application. I have been working with optional parameter attributes in .net 4.0 with no problems. I did notice that with 3.5 there is the opti

Answer 1

The Optional attribute has been available since C# 1.0, and is used when interoperating with external code, it has no effect on method calls in your own code.

As there is no optional parameters in C# 3, you can use overloading instead:

public static void MethodName(string name, string placeHolder) {
  ...
}

public static void MethodName(string name) {
  MethodName(name, null);
}

(Side note: There is no C# version 3.5, that is a framework version.)