C# learning classes

Question

Hi

i m learning classes

and every tuturial i read the code is like this

 

class:

namespace WindowsFormsApp8
{
    class Triangulo
    {
        public int A;
        public int C;
        public int D;
    }
}

 program:

 

static void Main()
   {
  Triangulo X, Y;
           X = new Triangulo();
           Y = new Triangulo();

           Y.A = 5;

           Console.Write( Y.A);
        }

 how can i put this in text fields or labels? thanks