using System;

public class Program

{

    public static void Main()

    {

        var integer = typeof(int);

        var nullableInteger =  typeof(int?);

        Type generic = typeof(Nullable<>);

        Type genericT = generic.MakeGenericType(integer);

        Console.WriteLine(nullableInteger.IsGenericType && nullableInteger ==  genericT);

        Type tt = typeof(GenericClass<int>);

        object a = Activator.CreateInstance(tt);

        Console.WriteLine(a);

    }

}

​

public class GenericClass<Int>

{

​

}