public partial class Form1 : Form
 2     {
 3         public Form1()
 4         {
 5             InitializeComponent();
 6         }
 7 
 8         public void getValue(string strV)
 9         {
10             this.textBox1.Text = strV;
11         }
12 
13         private void button1_Click(object sender, EventArgs e)
14         {
15             Form2 frm = new Form2();
16             //frm.fatherform = this;//将当前窗体赋给fatherform
17             //frm.getTextHandler += new Form2.GetTextHandler(getValue);//给事件赋值（注意：GetText方法的参数必须与GetTextHandler委托的参数一样，方可委托）
18             frm.getTextHandler = getValue;//将方法赋给委托对象
19             frm.ShowDialog();
20         }
21     }

 1 public partial class Form2 : Form
 2     {
 3         public Form2()
 4         {
 5             InitializeComponent();
 6         }
 7         //public Form1 fatherform;
 8 
 9         public delegate void GetTextHandler(string text);//声明委托
10        // public event GetTextHandler getTextHandler = null;//定义委托事件
11        public  GetTextHandler getTextHandler;//委托对象
12         private void button1_Click(object sender, EventArgs e)
13         {
14             //if (fatherform != null)
15             //{
16             //    fatherform.getValue(this.textBox1.Text.Trim());
17             //    this.Close();
18             //}
19             if (getTextHandler != null)
20             {
21                 getTextHandler(this.textBox1.Text.Trim());
22                 this.Close();
23             }
24         }
25     }