using System;

public class a {}

public class a<T> {}

public class b: a<int> {}

public class c: a {}

public class d: b {}

public class e: c {}

​

​

public class Program

{

    public static bool IsGenericA(object instance)

    {

        Type t = instance.GetType();

        while(t.BaseType != typeof(object))

          t = t.BaseType;

        return t.IsGenericType && t.GetGenericTypeDefinition() == typeof(a<>);

    }

​

    public static bool IsNonGenericA(object instance)

    {

        Type t = instance.GetType();

        while(t.BaseType != null && t.BaseType != typeof(object))

          t = t.BaseType;

        return t == typeof(a);

    }

    public static void PrintForInstance(object instance)

    {

        Console.WriteLine("{0}'s {1}", instance.GetType(), IsGenericA(instance)?"root is a<T>":(IsNonGenericA(instance)?"root is a":"root is not a or a<T>"));

    }

​

    public static void Main()

    {

        var foo = new b();

        var bar = new c();

        var baz = new d();

        var fooz = new e();

        PrintForInstance(foo);

        PrintForInstance(bar);

        PrintForInstance(baz);

        PrintForInstance(fooz);

    }

}