public class MyType
{
    [ContractAnnotation("throwOnNull:true => notnull")]
    public static Type GetType(string name, bool throwOnNull)
    {
        return null;
    }
}

var type = MyType.GetType("Some.Type", false);
var typeName = type.FullName;

var type = MyType.GetType("Some.Type", true);
var typeName = type.FullName;