c# (Windows App) การส่งค่าจาก UserContorl มายัง Form ส่งแล้วไม่มาน่ะครับ

public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
        }
        public string testWord = "Hello Wold";
        public event EventHandler ButtonClick
        {
            add { this.button1.Click += value; }
            remove { this.button1.Click -= value; }
        }
    }

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void userControl11_ButtonClick(object sender, EventArgs e)
        {
            label1.Text = userControl11.testWord; //รับค่ามาใช้งาน
        }
    }

public partial class Form1 : Form
{        
        public Form1()
        {
            InitializeComponent();
        }
       
        private void Form1_Load(object sender, EventArgs e)
        {
            
            var user1= new UserControl1();
            this.panel1.Controls.Add(user1);            
        }

        public void showIsNameFormActive(string _name)
        {           
            this.Text = _name;
        }
}

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
//อย่าลืมแก้ไขเป็นของตัวเองเด้อ หรือจะ copy แค่
namespace AUT_Kiosk_QC
{    
    static class Program
    {      
        //เพิ่มตรงนี้
        public static Form1 main ;        
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        ///       
        [STAThread]
        static void Main()
        {            
            //แค่ตรงนี้   
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            main = new Form1();
            main.Show();          
            Application.Run();
        }
    }
}

public void button1_Click(object sender, EventArgs e){
      Program.main.showIsNameFormActive("สิงึดติ");
}

public partial class Form1 : Form
{        
        public Form1()
        {
            InitializeComponent();
        }
       
        private void Form1_Load(object sender, EventArgs e)
        {
            
            var user1= new UserControl1();
            this.panel1.Controls.Add(user1);            
        }

        public void showIsNameFormActive(string _name)
        {           
            this.Text = _name;
        }
       protected override void OnClosing(CancelEventArgs e)
       {
            base.OnClosing(e);
            Application.Exit();
       }
}