using System; 
 using System.Collections.Generic; 
 using System.ComponentModel; 
 using System.Data; 
 using System.Data.Sql; 
 using System.Data.SqlClient; 
 using System.Drawing; 
 using System.Text; 
 using System.Windows.Forms; 
 using System.Xml; 
  
 namespace stserver 
 { 
   public partial class login : Form 
   { 
     public login() 
     { 
       InitializeComponent(); 
     } 
     public bool islogin = false; 
  
     private void btn_submit_Click(object sender, EventArgs e) 
     { 
       try 
       { 
         XmlDocument doc = new XmlDocument(); 
         doc.Load(Application.StartupPath + "\\config.xml"); 
         string connstr = doc.DocumentElement.SelectSingleNode("serverconnstr").InnerText; 
         string selectstr = "select top 1 id from admin where uid='" + txb_uid.Text + "' and pwd='" + txb_pwd.Text + "'"; 
         SqlConnection conn = new SqlConnection(connstr); 
         conn.Open(); 
         SqlCommand cmd = new SqlCommand(selectstr, conn); 
         SqlDataReader dr = cmd.ExecuteReader(); 
         if (dr.HasRows) 
         { 
           islogin = true; 
           dr.Close(); 
           conn.Close(); 
           conn.Dispose(); 
           MessageBox.Show("您好，" + txb_pwd.Text + "！，欢迎使用\n\n祝您工作愉快！", "欢迎", MessageBoxButtons.OK, MessageBoxIcon.Information); 
           this.Close(); 
         } 
         else 
         { 
           dr.Close(); 
           conn.Close(); 
           conn.Dispose(); 
           MessageBox.Show("登录失败！\n请检查您的登录用户名和密码是否正确。\n\n如果您忘记了自己的密码请联系技术部"); 
           txb_uid.Text = ""; 
           txb_pwd.Text = ""; 
           txb_uid.Focus(); 
         } 
         dr.Close(); 
         conn.Close(); 
         conn.Dispose(); 
       } 
       catch 
       { 
         MessageBox.Show("不能连接到服务器，请联系技术部","服务器故障",MessageBoxButtons.OK,MessageBoxIcon.Error); 
       } 
     } 
  
     private void btn_cancel_Click(object sender, EventArgs e) 
     { 
       Application.ExitThread(); 
     } 
   } 
 } 
  
 

 
 using System; 
 using System.Collections.Generic; 
 using System.Windows.Forms; 
  
 namespace stserver 
 {