窗体之间同步跟新文本怎么实现比较好

Question

先打开form1，点击按钮显示form2，两个窗体中都含有textEdit，在form中输入文本时，要求在form1的textEdit中同时更新，怎么实现呀，我在form1中做了一个事件处理，但怎么也触发不了这个事件
form1
 public test()
        {
            InitializeComponent();
        }
        private string _text = string.Empty;
        public string TextS
        {
            get { return this._text; }
            set
            {
                this._text = value;
                if (_text != null)
                {
                    this.OnChanged(new EventArgs());
                    this.Changed += new ChangedEventHandler(test_Changed);
                }
                else
                    _text = form2.Textstring;
            }
        }
        public delegate void ChangedEventHandler(object sender, EventArgs e);        //定义一个委托类型事件
        public event ChangedEventHandler Changed;
        //用于触发Changed事件
        protected void OnChanged(EventArgs e)
        {
            if (this.Changed != null)
            {
                this.Changed(this, e);
            }
        }
        void test_Changed(object sender, EventArgs e)
        {
            this.textEdit1.Text = _text;
        }
        
        test2 form2 = new test2();
        private void simpleButton1_Click(object sender, EventArgs e)
        {
           
           form2.ShowDialog();  
        }              form2
 public test2()
        {
            InitializeComponent();
        }
        string textstr="";
        public string Textstring
        {
            set { textstr = value; }
            get { return textstr; }
        }
        private void textEdit1_EditValueChanged(object sender, EventArgs e)
        {
            textstr = this.textEdit1.Text;        }

Answer 1

把form1的textbox改成public，然后就可以在form2中直接复制了不过你需要在form2中设立一个form1的引用        private void textEdit1_EditValueChanged(object sender, EventArgs e)
        {
            form1.textEdit1.Text = this.textEdit1.Text;        }

Answer 2

public test()
        {
            InitializeComponent();
        }
public TextBox tb
{
  get 
   {
     return textEdit;
   }
}
     
        test2 form2 = new test2(this);
        private void simpleButton1_Click(object sender, EventArgs e)
        {
           
           form2.ShowDialog();  
        }
//form2
test1 form1;
public test2(test1 fm)
        {
           form1=fm;
            InitializeComponent();
        }         private void textEdit1_EditValueChanged(object sender, EventArgs e)
        {
            form1.tb.Text= this.textEdit1.Text;        }