在Visual C#中的两个窗体之间切换和通信？

Form2 form2 = new Form2();
form2.Show();
this.Hide();

Form2 form2 = new Form2();
if (form2.ShowDialog() == DialogResult.OK)
{
    string data = form2.GetData();
    // 处理传递回来的数据
}

private string data;

public string GetData()
{
    return data;
}

private void btnOK_Click(object sender, EventArgs e)
{
    data = textBox1.Text;
    this.DialogResult = DialogResult.OK;
    this.Close();
}

public event EventHandler DataUpdated;

private void btnUpdate_Click(object sender, EventArgs e)
{
    // 触发事件
    DataUpdated?.Invoke(this, EventArgs.Empty);
}

public void SubscribeForm1Event(Form1 form1)
{
    form1.DataUpdated += Form1_DataUpdated;
}

private void Form1_DataUpdated(object sender, EventArgs e)
{
    // 处理事件
}