窗体之间传值

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Test
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //首先实例化实例一个f2出来
            Form2 f2 = new Form2();
            //将文本框里面的值传给f2里面定义的str2变量里面
            f2.str2 = textBox1.Text;
            f2.ShowDialog();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Test
{
    public partial class Form2 : Form
    {
        //定义一个公共变量str2来接收值
        public string str2 = "";

        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            textBox1.Text = str2;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Form3 f3 = new Form3();
            f3.str3 = textBox1.Text;
            f3.ShowDialog();
        }
    }
}