Check inside method whether some optional argument was passed

Question

How do I check if an optional argument was passed to a method?

public void ExampleMethod(int required, string optionalstr = \"default string\",
    int optio         


        

Answer 1

To determine whether an argument has been passed to an optional parameter

1. Define an extremely unlikely value as the default for the parameter.
2. If the optional parameter is a reference type such as a String, you can use null as the default value, provided this is not an expected value for the argument.
3. In the procedure code, compare the parameter against the default value and take the appropriate action.

https://msdn.microsoft.com/en-us/library/849zff9h(v=vs.100).aspx