Question

I know i can do the below to extend a class. I have a static class i would like to extend. How might i do it? I would like to write ClassName.MyFunc()

static public class SomeName
{
    static public int HelperFunction(this SomeClass v)

Answer 1

You can’t have extension methods on static classes because extension methods
are only applicable to instantiable
types and static classes cannot be
instantiated.

Check this code..

    public static bool IsEmail(this string email)
    {
        if (email != null)
        {
            return Regex.IsMatch(email, "EmailPattern");
        }

        return false;
    }

First parameter to IsEmail() is the extending type instance and not just the type itself. You can never have an instance of a static type.