c# - Using .StartsWith in a Switch statement?

Question

I'm working on a Switch statement and with two of the conditions I need to see if the values start with a specific value. The Switch statement does like this. The error says "cannot covert type bool to string".

Anyone know if I can use the StartsWith in a Switch or do I need to use If...Else statements?

switch(subArea)
            {
                case "4100":
                case "4101":
                case "4102":
                case "4200":
                    return "ABC";
                case "600A":
                    return "XWZ";
                case subArea.StartsWith("3*"):
                case subArea.StartsWith("03*"):
                    return "123";
                default:
                    return "ABCXYZ123";
            }

Answer 1

Since C# 7 you can do the following:

switch(subArea)
{
    case "4100":
    case "4101":
    case "4102":
    case "4200":
       return "ABC";
    case "600A":
       return "XWZ";
    case string s when s.StartsWith("3*"):
       return "123";
    case string s when s.StartsWith("03*"):
       return "123";
    default:
       return "ABCXYZ123";
}