Generic types.cs

    class Program
    {
        class Foo<T> { }
        class Bar<T> : Foo<T> { }
        class Concrete : Bar<string> { }

        class Another<T> : Foo<T> { }

        static void Main(string[] args)
        {
            Type genericDefinition = typeof(Concrete).BaseType.GetGenericTypeDefinition(); // Bar<>
            Console.WriteLine(genericDefinition.Name); // Bar`1
            Console.WriteLine(typeof(Foo<>).IsAssignableFrom(genericDefinition)); // False. WHY?! :(

            Console.WriteLine(genericDefinition.BaseType.Name); //Foo`1
            Console.WriteLine(genericDefinition.BaseType == typeof(Foo<>)); // False. WHY?!

            Console.WriteLine(genericDefinition.BaseType.GetGenericTypeDefinition() == typeof(Foo<>)); // Finally True!

            Console.WriteLine(typeof(Another<>).GetGenericTypeDefinition().BaseType == typeof(Bar<>).GetGenericTypeDefinition().BaseType); // False

            Console.ReadKey();
        }
    }