publicpartial class Form2 : Form 
{ 
    private string text; 
    private ListBox lb; 
    private int index; 
 
    //构造函数接收三个参数：选中行文本，ListBox控件，选中行索引 
    public Form2(string text,ListBox lb,int index) 
    { 
      this.text = text; 
      this.lb = lb; 
      this.index = index; 
      InitializeComponent(); 
      this.textBox1.Text = text; 
    } 
 
    private void btnChange_Click(object sender, EventArgs e) 
    {       
 
      string text = this.textBox1.Text; 
      this.lb.Items.RemoveAt(index); 
      this.lb.Items.Insert(index, text); 
      this.Close(); 
    } 
}

public partial class Form1 :Form 
{ 
    int index = 0; 
    string text = null; 
    public Form1() 
    { 
      InitializeComponent(); 
    } 
 
    private void listBox1_SelectedIndexChanged(object sender, EventArgse) 
    { 
      if (this.listBox1.SelectedItem != null) 
      { 
        text = this.listBox1.SelectedItem.ToString(); 
        index = this.listBox1.SelectedIndex; 
 
        //构造Form2同时传递参数 
        Form2 form2 = new Form2(text, listBox1, index); 
        form2.ShowDialog(); 
      } 
    } 
}

//声明Form2继承于Form1 
 
public partial classForm2 : Form1 
{ 
     publicint index; 
 
    public ListBox lb; 
    public Form2(string text) 
    {  
 
      //将继承过来的listBox设置为不可见 
 
      this.listBox1.Visible=false; 
      InitializeComponent(); 
      this.textBox1.Text = text; 
    } 
    private void btnChange_Click(object sender, EventArgs e) 
    { 
      string text = this.textBox1.Text; 
      this.lb.Items.RemoveAt(index); 
      this.lb.Items.Insert(index,text);      
      this.Close(); 
 
    } 
}

public partial class Form1 :Form 
{ 
    public int index = 0; 
    public string text = null; 
    public Form1() 
    { 
      InitializeComponent(); 
    } 
 
    private void listBox1_SelectedIndexChanged(object sender, EventArgse) 
    { 
      if (this.listBox1.SelectedItem != null) 
      { 
        text = this.listBox1.SelectedItem.ToString(); 
        index = this.listBox1.SelectedIndex; 
        Form2 form2 = new Form2(text); 
 
        //构造完Form2后，为Form2中各参数赋值 
        form2.lb =this.listBox1;         
        form2.index = index; 
        form2.Show(); 
      } 
    } 
}

this.lb=base.listBox1; 
 
this.index=base.index; 

//定义一个需要string类型参数的委托 
publicdelegate void MyDelegate(string text); 
public partial class Form2 :Form1 
{ 
    //定义该委托的事件 
    public event MyDelegate MyEvent; 
    public Form2(string text) 
    {  
      InitializeComponent(); 
      this.textBox1.Text = text; 
    } 
    private void btnChange_Click(object sender, EventArgs e) 
    { 
 
      //触发事件，并将修改后的文本回传 
      MyEvent(this.textBox1.Text); 
      this.Close(); 
    } 
} 

public partial class Form1 :Form 
{ 
    public int index = 0; 
    public string text = null; 
    public Form1() 
    { 
      InitializeComponent(); 
    } 
 
    private void listBox1_SelectedIndexChanged(object sender, EventArgse) 
    { 
      if (this.listBox1.SelectedItem != null) 
      { 
        text = this.listBox1.SelectedItem.ToString(); 
        index = this.listBox1.SelectedIndex; 
        Form2 form2 = new Form2(text); 
 
        //注册form2_MyEvent方法的MyEvent事件 
        form2.MyEvent += new MyDelegate(form2_MyEvent); 
        form2.Show(); 
      } 
    } 
 
    //处理 
 
    void form2_MyEvent(string text) 
    { 
      this.listBox1.Items.RemoveAt(index); 
      this.listBox1.Items.Insert(index, text); 
    } 
}