小白我阐述一下我的问题点：点击主窗体按钮弹出一个Form2，然后在form2上点击按钮弹出form3.我想在form3上通过按钮触发主窗体form1的一个事件。如何实现。目前小弟只能做到在form2上可以触发form1的一个事件。求高手指导。代码如下
Form1代码：
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        Form3 bc = null;
        public Form1()
        {
            InitializeComponent();
            bc = new Form3();   
            bc.MyEvent += new Form3.MyDelegate(writeplc);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 a = new Form2();
            a.ShowDialog();
        }

        void writeplc()
        {
            this.textBox1.Text += "已单击b窗体按钮\r\n";
        }
    }
}

Form2代码：

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
       public Form2()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Form3 bd = new Form3();
            bd.ShowDialog();
        }
    }
}

Form3代码：
 namespace WindowsFormsApplication1
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }
        public delegate void MyDelegate();      
        public event MyDelegate MyEvent;
        private void button1_Click(object sender, EventArgs e)
        {
            if (MyEvent != null)
                MyEvent();
        }
        }
    }

谢谢版指导，已经OK！感谢