冰天雪地跪地求教！！！！！

Question

Child1和Child2两个都是子窗体，同时加载Child1窗体中：有1个TextBox 1个Button
    public partial class Child1 : Form
    {
        public Child1()
        {
            InitializeComponent();
        }
        public delegate void MyDelete(string text);
        public event MyDelete MyEvent;        private void button1_Click(object sender, EventArgs e)
        {
            MyEvent(this.textBox1.Text.ToString());          报错：未将对象引用到实例
        }
    }Child2窗体中：有1个TetxBox
        public Child2()
        {
            InitializeComponent();
        }
        public void fun(string text)
        {
            this.textBox1.Text = text;
        }
        private void Child2_Load(object sender, EventArgs e)
        {
            Child1 child1 = new Child1();
            child1.MyEvent+=new Child1.MyDelete(fun);
        }
    }

Answer 1

if(MyEvent!=null){
MyEvent(this.textBox1.Text.ToString());
}