給你一些提示，你可以先嘗試自己寫寫看：
假設Form1為啟動主窗體，在Form1的Load事件中已經Show了一個Form2的窗體執行個體。其中Form2的構造函數應該已經被重載了一次(該重載函數應該包含Form1類型作為參數)：
public partial class Form2
{
//省略其它生成代碼……
//添加Form1類内部變量
private Form1 Form1{get;set;}
//自己添加新構造函數
public Form2(Form1 frm)
{
Form1 = frm;
Form1.MyEvent+=new Action(MyEventHandler);
}
………………
private void MyEventHandler()
{
//當Form1事件被觸發的時候，Form2幹啥就幹啥……
}
}
同時不要忘記為Form1定義委托事件：
public event Action MyEvent = null;
然後在Form1的Button點選(或者類似事件)，觸發調用：
MyEvent();
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