//窗體1的代碼
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 WindowsFormsApplication1
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
     
    private void button1_Click(object sender, EventArgs e)
    {
      sharedclass.sharedvalue = textBox1.Text.ToString(); //靜態(tài)變量的用法：類名.變量名 賦值給靜態(tài)變量
      Form2 frm2 = new Form2();
      frm2.Show();     
    }
  }
  public static class sharedclass //在命名空間設(shè)置一個靜態(tài)類sharedclass，不要放置在form1前面
  {
    public static string sharedvalue; //設(shè)置一個靜態(tài)變量sharedvalue
  }
}

//窗體2的代碼
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 WindowsFormsApplication1
{
  public partial class Form2 : Form
  {
    public Form2()
    {
      InitializeComponent();
      textBox1.Text = sharedclass.sharedvalue; //靜態(tài)變量傳入給窗口2的textBox
    }
  }
}