初学者求问..关于委托
假设有一个父窗体FormMian
FormMian有2个按钮Bt1,Bt2，功能分别是，显示From2子窗体，显示From3子窗体
我想问的是，
在添加Bt3，其功能就是，不管你打开一个子窗体
点下Bt3，关闭FormMian父窗体
内的所有子窗体，
用委托该怎么实现？

委托今天刚讲，似懂非懂的，另求高手讲解一下
感激.. 委托
[解决办法]

private EventHandler CloseDialog;
        private Form form1 = new Form1();
        private Form form2 = new Form2();
        private void CloseForm1(object sender,EventArgs e)
        {
            form1.Close();
        }
        private void CloseForm2(object sender, EventArgs e)
        {
            form2.Close();
        }
        public FrmMain()
        {
            this.CloseDialog += CloseForm1;
            this.CloseDialog += CloseForm2;
            InitializeComponent();
        }
        
        private void button1_Click(object sender, EventArgs e)
        {
            form1.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            form2.Show();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            CloseDialog(this, null);
        }

是这么个意思？
[解决办法]
http://bbs.csdn.net/topics/360140208