聲明對象：
類名+對象名=new 類名(參數);如：Penson mary = new Penson();
而在組件、控件等中 如： Checkbox
private void checkBox1_CheckedChanged(object sender, EventArgs e)< xmlnamespace prefix ="o" ns ="urn:schemas-microsoft-com:office:office" />
{
CheckBox a = sender as CheckBox;
//其他代碼
}
private void checkBox2_CheckedChanged(object s, EventArgs e)
{
CheckBox a = s as CheckBox;
//其他代碼
}