1：参数的传递
public partial class Form1 : Form
      {
          public Form1()
          {
              InitializeComponent();
          }
  
          private void button1_Click(object sender, EventArgs e)
{
Hide();
Form2 form = new Form2(textBox1.Text);
form.ShowDialog();
Show();
}
}

2：获取传递的参数

public Form2()
{
InitializeComponent();
}
public Form2(string text)
{
InitializeComponent();
this.text = text;
}
private void Form2_Load(object sender, EventArgs e)
{
label1.Text = "Hello, world!" + text;
}