Yes, it’s possible.
You can write:
using System;
using System.Collections.Generic;
namespace ConsoleApplication12
{
using MyAlias = List<Tuple<int, string, int>>;
}
or, if declared outside the namespace:
using System;
using System.Collections.Generic;
using MyAlias = System.Collections.Generic.List<System.Tuple<int, string, int>>;
namespace ConsoleApplication12
{
}
then use it as a type:
MyAlias test = new MyAlias();