建構函式實現表單間傳值

///Form1.cs  the form contains a textbox and a buttonusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace 表單間通迅{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            Form2 frm = new Form2(this.textBox1);            frm.Show();        }    }}///Form2.cs  the form contains a textbox and a buttonusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace 表單間通迅{    public partial class Form2 : Form    {        private delegate void dg();        /// <summary>        /// 讓其與表單1的TextBox1同一個引用。        /// </summary>        private TextBox textBox12;        public Form2()        {            InitializeComponent();        }        public Form2(TextBox txtBox)        {            InitializeComponent();            textBox1.Text = txtBox.Text; ;            this.textBox12 = txtBox;                    }        private void button1_Click(object sender, EventArgs e)        {            textBox12 .Text  = textBox1.Text;            this.Close();                    }    }}