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本人想做一个登录系统,通过数字证书和动态密码登录,该怎么做?

希望各为大牛给点思路和代码! --------------------编程问答-------------------- --------------------编程问答-------------------- 数字证书
http://archive.cnblogs.com/a/2117996/

动态密码登陆

using System;
using System.Windows.Forms;
using System.Data;
using System.Drawing;
using System.Data.SqlClient;


public class login:System.Windows.Forms.Form


   Button b_denglv=new Button();
   Button b_tuichu=new Button();
   Label l_id=new Label();
   Label l_mm= new Label();
   TextBox tb_id =new TextBox();
   TextBox tb_mm=new TextBox();
  
   public login () // login类的构造函数
    {
     InitializeComponent();
    }
   
   
   public void InitializeComponent()
    {
     this.Text="登录";//this 表示对当前类的实例或者对象的引用。
     this.BackColor = System.Drawing.Color.Blue;
     this.BackgroundImage =Image.FromFile(@"E:\temp\Csharp\1.jpg");
     this.ClientSize = new System.Drawing.Size(500, 300);
     this.MinimizeBox = false;
     this.MaximizeBox = false;

    
     this.l_id.Location =new Point(275,180);
     this.l_id.ClientSize=new Size(50,20);
     this.l_id.BackColor = System.Drawing.Color.Red;
     this.l_id.Text="帐号:";
     this.l_id.Font = new System.Drawing.Font("华文楷体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
    
     this.tb_id.Location =new Point(335,180);
     this.tb_id.ClientSize=new Size(120,20);
     this.tb_id.BackColor = System.Drawing.Color.Red;
    
     this.l_mm.Location =new Point(275,210);
     this.l_mm.ClientSize=new Size(50,20);
     this.l_mm.BackColor = System.Drawing.Color.Red;
     this.l_mm.Text="密码";
     this.l_mm.Font = new System.Drawing.Font("华文楷体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
       
    
     this.tb_mm.Location =new Point(335,210);
     this.tb_mm.ClientSize=new Size(120,20);
     this.tb_mm.BackColor = System.Drawing.Color.Red;
     this.tb_mm.PasswordChar='&';
    
    
     this.b_denglv.Location =new Point(275,240);
     this.b_denglv.ClientSize=new Size(80,30);
     this.b_denglv.BackColor = System.Drawing.Color.Red;
     this.b_denglv.Text="登 录";
     this.b_denglv.Font = new System.Drawing.Font("华文楷体", 15F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
     this.b_denglv.Click+=new System.EventHandler(this.b_denglv_Click);
    
    
     this.b_tuichu.Location =new Point(377,240);
     this.b_tuichu.ClientSize=new Size(80,30);
     this.b_tuichu.BackColor = System.Drawing.Color.Red;
     this.b_tuichu.Text="退 出";
     this.b_tuichu.Font = new System.Drawing.Font("华文楷体", 15F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
     this.b_tuichu.Click+=new System.EventHandler(this.b_tuichu_Click);
    
     this.Controls.Add(this.b_denglv);
     this.Controls.Add(this.b_tuichu);
     this.Controls.Add(this.tb_id);
     this.Controls.Add(this.tb_mm);
     this.Controls.Add(this.l_id);
     this.Controls.Add(this.l_mm);
    
    }
  

  
  
   private void b_denglv_Click(object sender, EventArgs e)
        {
   
    string connection="Initial Catalog=jkda;server=WWW-6A09A18B837;User ID=sa;Password=123";
    string mysql="select password from t_employee where loginname='"+this.tb_id.Text+"'and password='"+this.tb_mm.Text+"'";
    SqlConnection cn = new SqlConnection (connection);
    cn.Open();
   
    SqlCommand cmd=new SqlCommand(mysql,cn);
   
    SqlDataReader rdr=cmd.ExecuteReader();
     
   
    if (tb_mm.Text ==""||tb_id .Text =="")
     {
      MessageBox.Show("还有项没有填写!");
     }
    else
     {
       if(rdr.Read())
       {
        MessageBox.Show("进入系统");                  
       }
      
      else
       {
        MessageBox.Show("用户名或者密码错误,请重新输入!");
       }
       rdr.Close();
     }
     
     cn.Close();
   } 
  
  
   private void b_tuichu_Click(object sender,EventArgs e)
    {
     this.Close();
    }

}
public class startRun
{
[STAThread]
   static void Main()
    {
     Application.Run(new login());
    }
}
 


补充:.NET技术 ,  C#
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