using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace eTagTech.HelloWorld
{
    public partial class Form1 : Form
    {
        static ID id = new ID();
        class ID
        {
            private String id = null;
           // automatic properties
            public String Form1
            {
                get
                {
                    return id;
                }
                set
                {
                    id = value;
                }
            }
        }
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Form1.id.Form1 = textBox1.Text;
            
            
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
          
        }
         
    }
}
Ho creato una variabile di istanza : static ID id = new ID();
di cui qui faccio il set :  Form1.id.Form1 = textBox1.Text;
Ora vorrei capire come recuperare il valore inserito da tastiera nel main:
using eTagTech.SDK;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using eTagTech.HelloWorld;
namespace eTagTech.HelloWorld
{
    static class Program
    {
        /// <summary>
        /// Punto di ingresso principale dell'applicazione.
        /// </summary>
        [STAThread]
        
        
        static void Main()
        {
            
          
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
           // Form1 form = new Form1();
            
            .
            
            
           
            List<string> TAG_LIST = new List<string>() { "001E3C", "001E3A", "001E45", "001E3F", "001E43" };
            Server.Instance.Start();
            Server.Instance.StationEventHandler += Instance_StationEventHandler;
            Server.Instance.ResultEventHandler += Instance_ResultEventHandler;
        }
        static void Instance_StationEventHandler(object sender, SDK.Event.StationEventArgs e)
        {
            Console.WriteLine("Comunicazione con box");
            string msg = string.Format("[{0:yy-MM-dd HH:mm:ss:ff}] Station ID:{1}, IP:{2}, Shop Code:{3}, Online:{4}", DateTime.Now, e.StationID, e.IP, e.Shop, e.Online);
            Logger.LogHelper.Debug(msg);
            Console.WriteLine(msg);
        }
        static void Instance_ResultEventHandler(object sender, SDK.Event.ResultEventArgs e)
        {
            foreach (var result in e.ResultList)
            {
                Console.WriteLine(string.Format("--TagID:{0} Status:{1} ServiceCode:{2} Power:{3}({4}) RSSI:{5} Temperature:{6}",
                    result.TagID, result.TagStatus, result.BatchCode, result.PowerLevel, result.PowerValue, result.Signal, result.Temperature));
                //Program.v.Voltaggio = result.PowerValue;
            }
        }
    }
}