关于登陆验证的问题，菜鸟上路球帮助

string sql = "select * from user where (LoginID='' or USBKey='') and Password=''";
Default页的代码
  <table><tr>
  <td align="center" height="30" class="STYLE10">验证码:</td>
  <td style="height: 30px; width: 265px;"><input runat=server name="Txt_imgCode" type="text" id="Txt_imgCode" size="5" maxlength="5" tabindex="3"/>
  <img id="CodeImg" onclick="this.src='CheckCode.aspx'" src="CheckCode.aspx" />
  <input onclick="document.getElementById('CodeImg').src='CheckCode.aspx?tmp='+Math.random()"
  type="button" value="看不清,点击换一张" name="Btn_Re" style="color: #ffffcc; border-top-style: none; border-right-style: none; border-left-style: none; background-color: transparent; border-bottom-style: none; width: 117px;" />
      </td>
  </tr>
</table>
    <br />
      <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button_Click" />Default.aspx.cs的代码
  protected void Button_Click(object sender, EventArgs e)
    {
        if (Txt_imgCode.Value.Trim() == Session["CheckCode"].ToString())
            Response.Redirect("Default.aspx");
        else
            Response.Write("<script>alert('验证码错误！')</script>");
CheckCode.aspx的代码
<%@ Page language="c#" Inherits="Guestbook.CheckCode" CodeFile="CheckCode.aspx.cs" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
  <HEAD>
  <title>CheckCode</title>
  <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
  <meta name="CODE_LANGUAGE" Content="C#">
  <meta name="vs_defaultClientScript" content="JavaScript">
  <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD>
  <body>
  <form id="Form1" method="post" runat="server">
  <FONT face="宋体"></FONT>
  </form>
</body>
</HTML>
CheckCode.aspx.cs的代码
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;namespace Guestbook
{
    /**//// <summary>
    /// 页面检查生成的Session["CheckCode"]
    /// </summary>
    public partial class CheckCode : System.Web.UI.Page
{            protected void Page_Load(object sender, System.EventArgs e)
           {
                this.CreateCheckCodeImage(GenerateCheckCode());
            }        private string GenerateCheckCode()
  {
            int number;
            char code;
            string checkCode = String.Empty;            System.Random random = new Random();            for(int i=0; i<5; i++)
       {
                number = random.Next();                if(number % 2 == 0)
                    code = (char)('0' + (char)(number % 10));
                else
                    code = (char)('A' + (char)(number % 26));                checkCode += code.ToString();
            }            //Response.Cookies.Add(new HttpCookie("CheckCode", checkCode));
            Session["CheckCode"]=checkCode;
            return checkCode;
        }        private void CreateCheckCodeImage(string checkCode)
        {
            if(checkCode == null || checkCode.Trim() == String.Empty)
                return;            System.Drawing.Bitmap image = new System.Drawing.Bitmap((int)Math.Ceiling((checkCode.Length * 12.5)), 22);
            Graphics g = Graphics.FromImage(image);            try
            {
                //生成随机生成器
                Random random = new Random();                //清空图片背景色
                g.Clear(Color.White);                //画图片的背景噪音线
                for(int i=0; i<25; i++)
                {
                    int x1 = random.Next(image.Width);
                    int x2 = random.Next(image.Width);
                    int y1 = random.Next(image.Height);
                    int y2 = random.Next(image.Height);                    g.DrawLine(new Pen(Color.Silver), x1, y1, x2, y2);
                }                Font font = new System.Drawing.Font("Arial", 12, (System.Drawing.FontStyle.Bold | System.Drawing.FontStyle.Italic));
                System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush(new Rectangle(0, 0, image.Width, image.Height), Color.Blue, Color.DarkRed, 1.2f, true);
                g.DrawString(checkCode, font, brush, 2, 2);                //画图片的前景噪音点
                for(int i=0; i<100; i++)
                {
                    int x = random.Next(image.Width);
                    int y = random.Next(image.Height);                    image.SetPixel(x, y, Color.FromArgb(random.Next()));
                }                //画图片的边框线
                g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1);                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());
            }
            finally
            {
                g.Dispose();
                image.Dispose();
            }
        }
    }
}
VS本就有自带的验证控件，验证不能为空的。。
网上一搜一大堆。。
登录页面代码:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Login.aspx.cs" Inherits="Login" %><%@ Register Assembly="WebValidates" Namespace="WebValidates" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <table width="800" height="600" border="0" align="center" background="images/10.bmp">
                <tr>
                    <td align="center">
                        <table style="width: 565px; height: 184px">
                            <tr>
                                <td style="width: 71px; color: #0033ff;" align="center">
                                    登录名：</td>
                                <td style="width: 100px">
                                    <asp:TextBox ID="txtLoginName" runat="server"></asp:TextBox>
                                </td>
                                <td style="width: 100px">
                                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="请输入登录名！"
                                        ControlToValidate="txtLoginName" Width="151px"></asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td style="width: 71px; color: #0033ff;" align="center">
                                    密   码：</td>
                                <td style="width: 100px">
                                    <asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox>
                                </td>
                                <td style="width: 100px">
                                    <asp:RequiredFieldValidator ID="rfvPassword" runat="server" ErrorMessage="请输入密码！"
                                        ControlToValidate="txtPassword" Width="149px"></asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td style="width: 71px; color: #0033ff;" align="center">
                                    验证码：</td>
                                <td style="width: 100px">
                                    <asp:TextBox ID="txtCode" runat="server"></asp:TextBox>
                                </td>
                                <td style="width: 100px">
                                    <cc1:SerialNumber ID="snCode" runat="server">
                                    </cc1:SerialNumber>
                                </td>
                            </tr>
                            <tr>
                                <td style="width: 71px" align="center">
                                    <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/images/btn_login.gif"
                                        OnClick="ImgLogin_Click" /></td>
                                <td style="width: 100px">
                                    <asp:ImageButton ID="ImageButton2" runat="server" ImageUrl="~/images/az-newuser-gold-3d.gif"
                                        OnClick="ImgReg_Click" CausesValidation="False" /></td>
                                <td style="width: 100px">
                                    <asp:Label ID="lblMessage" runat="server" ForeColor="Red"></asp:Label>
                                </td>
                            </tr>
                        </table>
                    </td>
                </tr>
            </table>
        </div>
    </form>
</body>
</html>
cs文件代码：
protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            snCode.Create();//创建新验证码
        }
    }
    //登录
    protected void ImgLogin_Click(object sender, ImageClickEventArgs e)
    {
        if (!CheckCode())
        {
            lblMessage.Text = "验证码错误！";
            return;
        }
        else
        {
            lblMessage.Text = "";
        }
        user.LoginName = txtLoginName.Text.Trim();
        string pwd = UserManager.SelectUser(user);
        if (pwd == "" || string.IsNullOrEmpty(pwd))
        {
            Response.Write("<script>alert('不存在该用户，请重新登录！')</script>");
            return;
        }
        else
        {
            if (txtPassword.Text.Trim() != pwd)
            {
                Response.Write("<script>alert('输入的密码有误，请重新输入！')</script>");
                return;
            }
            else
            {
                Session["UTypeName"] = UserManager.GetGroupNameByLoginName(txtLoginName.Text.Trim());
                string type=Convert.ToString(Session["UTypeName"]);
                Session["UserName"] = txtLoginName.Text.Trim();
                Response.Write("<script>alert('登录成功！')</script>");
                if (type == "管理员")
                {
                    Response.Redirect("FrameClsss.aspx");
                }
                else
                {
                    Response.Redirect("Main.aspx");
                }
                //Response.Redirect("FrameClsss.aspx");
            }
        }
    }
//验证方法
    public bool CheckCode()
    {
        if (snCode.CheckSN(txtCode.Text.Trim()))
        {
            return true;
        }
        else
        {
            snCode.Create();
            return false;
        }
    }

调试易

关于登陆验证的问题，菜鸟上路球帮助

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