What is this C# structure

Question

I have come across the following code and am not sure what it means?

public class Countries
{
    public Countries();

    public static bool AllowInvoice(string pCountryCode);
    public static bool IsPostcodeMandatory(string pCountryCode);
}

This code is then called in the following way:

Contact.IncludePostCode = Countries.IsPostcodeMandatory(countryCode);

It seems to me that this is an interface? Where the method is being defined, but the body is being written elsewhere?

If this is the case, I would expect that when I search the whole project, I would find the code for the body of the method, but I do not find it anywhere?

Any suggestions?

Answer 1

This class is defined in a referenced assembly, Visual Studio is showing you the class's metadata.

What you see here are just the method signatures, not their implementation. This code would not compile.