窗体传值 (通过事件)

//主窗体 通过button创建子窗体
namespace 事件
{
    public partial class Form1 : Form
    {
public static Form1 myf;
        public Form1()
        {
            InitializeComponent();
            myf = this;
        }
  private void button1_Click(object sender, EventArgs e)
        {
            Form2 frm = new Form2();
            frm.Show();
        }
        public void frm_eventAddress(string a)
        {
            label1.Text = a;
        }
}

namespace 事件
{
    public partial class Form2 : Form
    {
        //声明一个委托方法
        public delegate void addAddress(string a);
        //申明一个事件
        public event addAddress eventAddress;

        public Form2()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //添加订阅者
            eventAddress += new addAddress(Form2_eventAddress);
            //触发事件
            eventAddress(textBox1.Text);
        }

        void Form2_eventAddress(string a)
        {
            Form1.myf.frm_eventAddress(a);
        }
    }
}