ขอสอบถามเกี่ยวกับการส่งค่าข้าม form โดยใช้ set กับ get หน่อยครับ

Public String val;
public void setVal(String strVal)
{
val = strVal;
}
public String getVal()
{
return val;
} 

  testClass tc = new   testClass();
tc.setVal = "ทดสอบ"

 testClass tc = new   testClass();
String test = tc.getVal();

testClass tc = new   testClass();
tc.setVal = "ทดสอบ"

testClass tc = new   testClass(); // new class ใหม่ แถมชื่อ tc เดียวกันกับ form แรกอีก
String test = tc.getVal();

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

namespace ConsoleApplication1
{
    class Test
    {
        class ShareStorage
        {
            private static ShareStorage m_instance = null;
            private string m_val;
            public static ShareStorage GetInstance()
            {
                if (m_instance == null)
                {
                    m_instance = new ShareStorage();
                }
                return m_instance;
            }
            public void SetVal(string strVal)
            {
                m_val = strVal;
            }
            public string GetVal()
            {
                return m_val;
            }
        }

        public void SetVal(string strVal)
        {
            ShareStorage.GetInstance().SetVal(strVal);
        }

        public string GetVal()
        {
            return ShareStorage.GetInstance().GetVal();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Test test1 = new Test();
            Test test2 = new Test();
            test1.SetVal("Hello world people.");
            Console.WriteLine("Test1 = " + test1.GetVal());
            Console.WriteLine("Test2 = " + test2.GetVal());
        }
    }
}