accessing two struct members in a fuction from a windows form

[Balzy]

i have a function in which i used a struct to return it two values. now i want to call the function to work from a form and i have a problems with the function.
here are the codes:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public struct TriAnaSplit
{
    public int col1;
    public int col2;
};

 public TriAnaSplit Triadic(int pivotcolor)
        {

            int TestVar1, TestVar2, pluscolor, mincolor;
            TriAnaSplit Tri_val;
            TestVar1 = pivotcolor + 120;
            if (TestVar1 <= 360)
                pluscolor = TestVar1;
            else
                pluscolor = TestVar1 - 360;

            TestVar2 = pivotcolor - 120;
            if (TestVar2 >= 0)
                mincolor = TestVar2;
            else
                mincolor = 360 - Math.Abs(TestVar2);

            Tri_val.col1 = pluscolor;
            Tri_val.col2 = mincolor;

            return Tri_val;
        }