说明：本文讲解两个窗体之间的传值，主要用到两个窗体，form1,form2

1、在form1窗体单击按钮，打开窗体form2，然后把form2中文本框的值传递给form1

form1中的代码：

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 FormToform
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //获取值
        private void button1_Click(object sender, EventArgs e)
        {
            Form2 fr = new Form2();
            DialogResult rsult = fr.ShowDialog();
            if(rsult==DialogResult.OK)
            {
                //获取窗体2传回来的值
                listBox1.Items.Add(fr.UKind);
                listBox1.Items.Add(fr.UName);
            }
        }
    }
}
窗体form2的代码：

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 FormToform
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }
        //给窗体定义两个属性
     
        public string UKind {
            get { return textBox1.Text; }
            set { textBox1.Text= value; }
        }   
        public string UName
        {
            get { return textBox2.Text; }
            set { textBox2.Text = value; }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            DialogResult = DialogResult.OK;
        }
    }
}
2、在form1窗体单击按钮，打开窗体form2，然后给form2中文本框赋值

form1中按钮的代码如下：

  private void button2_Click(object sender, EventArgs e)
        {
            Form2 fr = new Form2();
            fr.UName = "姓名";
            fr.UKind = "类别";
            DialogResult rsult = fr.ShowDialog();
           
        }

form2与标题1一样这里不做赘述