<span style="font-size:18px;">private void button3_Click(object sender, EventArgs e) 
{ 
 textBox1.Text = ""; 
 textBox2.Text = ""; 
}</span> 

<span style="font-size:18px;">private void button2_Click(object sender, EventArgs e) 
{ 
  Close(); 
}</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
 
namespace WindowsForms 
{ 
  public partial class Form1 : Form 
  { 
    public Form1() 
    { 
      InitializeComponent(); 
    } 
 
    private void button1_Click(object sender, EventArgs e) 
    { 
      string str = textBox1.Text;//获取你在textBox1中输入的信息 
      Form2 ad = new Form2(str);//创建一个学生信息管理系统主界面的对象 
      ad.Show();//点击确定后进入学生信息管理系统主界面 
      this.Hide();//单击确定后隐藏登录窗口 
    } 
 
    private void button2_Click(object sender, EventArgs e) 
    { 
      Application.Exit();//点击取消退出整个程序 
    } 
 
    private void button3_Click(object sender, EventArgs e) 
    { 
      textBox1.Text = "";//这是清空你写入的用户名称 
      textBox2.Text = "";//这是清空你写入的用户密码 
    } 
  } 
}</span></span> 

<span style="font-size:18px;"><span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
 
namespace WindowsForms 
{ 
  public partial class Form2 : Form 
  { 
    public Form2(string s) 
    { 
      InitializeComponent(); 
      tssl_name.Text = s;//将登陆窗口textBox1输入的信息传递给状态栏Text属性 
    } 
 
    private void 退出ToolStripMenuItem_Click(object sender, EventArgs e) 
    { 
      Application.Exit();//单击主菜单中的退出我们退出整个程序 
    } 
 
    private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e) 
    { 
 
    } 
 
    private void toolStripButton1_Click(object sender, EventArgs e) 
    { 
      Children qq = new Children();//创建一个子窗体的实例 
      qq.MdiParent = this;//要求子窗体的父窗体是MDI窗体 
      qq.Show(); 
    } 
 
    private void 学生信息ToolStripMenuItem_Click(object sender, EventArgs e) 
    { 
      Children1 c1 = new Children1(); 
      c1.MdiParent = this; 
      c1.Show(); 
    } 
 
    private void 用户信息ToolStripMenuItem_Click(object sender, EventArgs e) 
    { 
      Children2 c2 = new Children2(); 
      c2.MdiParent = this; 
      c2.Show(); 
    } 
 
    private void 用户密码修改ToolStripMenuItem_Click(object sender, EventArgs e) 
    { 
      Children3 c3 = new Children3(); 
      c3.MdiParent = this; 
      c3.Show(); 
    } 
  } 
}</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
 
namespace WindowsForms 
{ 
  public partial class Children1 : Form 
  { 
    public Children1() 
    { 
      InitializeComponent(); 
    } 
 
    private void button2_Click(object sender, EventArgs e) 
    { 
      Close(); 
    } 
  } 
}</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
 
namespace WindowsForms 
{ 
  public partial class Children2 : Form 
  { 
    public Children2() 
    { 
      InitializeComponent(); 
    } 
 
    private void button2_Click(object sender, EventArgs e) 
    { 
      Close(); 
    } 
 
    private void s(object sender, EventArgs e) 
    { 
    } 
  } 
}</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.ComponentModel; 
using System.Data; 
using System.Drawing; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
using System.Windows.Forms; 
 
namespace WindowsForms 
{ 
  public partial class Children3 : Form 
  { 
    public Children3() 
    { 
      InitializeComponent(); 
    } 
 
    private void button2_Click(object sender, EventArgs e) 
    { 
      Close(); 
    } 
  } 
}</span>