How to restrict the parameter of a method to a specific set of values?

Question

I would like to pass an argument to a method.

public void Foo(string range)
{
} 

How can I restrict or limit the string passed to this method? Like only High/Medium/Low can be chosen when call Foo, not any other string?

Answer 1

You can pass as enum, instead of string.

public void Foo(Range range)
{
}


enum Range {
    High,
    Medium,
    Low
}