winform子窗体传值给父窗体

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Login
{
public partial class Form1 : Form
{
public static string s1;
public static string s2;
public Form1()
{
InitializeComponent();


}

private void textBox2_TextChanged(object sender, EventArgs e)
{

}

private void btnOK_Click(object sender, EventArgs e)
{

s1 = this.texName.Text;
s2 = this.texPassword.Text;
//this.Hide();
Form2 frm2 = new Form2();
frm2.ShowDialog();
this.texName.Text = s1;
this.texPassword.Text = s2;


}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{

e.Cancel = true;
if (MessageBox.Show("是否退出", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
{
e.Cancel = false;
}
}


}
}




using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Login
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
this.txtName.Text = Form1.s1;
this.txtPassword.Text = Form1.s2;
}


private void btnUpdate_Click(object sender, EventArgs e)//这个事件用来让子窗体文本框中的值传回给父窗体中的变量
{

Form1 frm1 = new Form1();//初始化父窗体，让其文本中的值发生改变
Form1.s1 = this.txtName.Text;
Form1.s2 = this.txtPassword.Text;
this.Close();//关闭子窗体




}


}
}