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  using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing.Drawing2D;
using System.Drawing;
public partial class reigster : System.Web.UI.Page
{
  protected void Page_Load(object sender, EventArgs e)
  {


  if (!this.IsPostBack)
  {


  CreateCheckCodeImage(rndnum(4));
  }

  }



  protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
  {



  }



private string rndnum(int vcodenum) 


  string vnum = null;

  string vchar="0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p"+ 

  ",q,r,s,t,u,v,w,x,y,z"+"A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";


  //¶Ô×Ö·û´®½øÐÐÇи
  string[] mysqlit = vchar.Split(',');

  Random num = new Random();

  //Ëæ»ú³éÈ¡4¸ö×Ö·û £»<


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Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.Design
Imports System.Web.UI.WebControls
Namespace CBDAspNet.WebControls.HTML
  ''' <summary>
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protected void btnLogin_Click(object sender, EventArgs e)
  {
  SqlConnection conn = new SqlConnection("Server = (local);user id = sa;pwd = 1;database = Login");
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