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static void Main(string[] args)
{
Type a = typeof(A);
Type b = typeof(B);
Console.WriteLine(a.IsAssignableFrom(b)); //true
Console.WriteLine(b.IsAssignableFrom(a)); //false
Type c = typeof(Nullable<int>);
Type d = typeof(int);
Console.WriteLine(c.IsAssignableFrom(d)); //true
Console.WriteLine(d.IsAssignableFrom(c)); //false
Console.ReadLine();
}
class A { }
class B : A { }