asp.net第三方控件（验证码），导入控件后运行出现这样的问题，请问还需要添加什么方法或其他的吗？

悬赏园豆：5 [已解决问题] 解决于 2013-08-02 08:45

  1 using System;
  2 using System.Collections;
  3 using System.Configuration;
  4 using System.Data;
  5 using System.Linq;
  6 using System.Web;
  7 using System.Web.Security;
  8 using System.Web.UI;
  9 using System.Web.UI.HtmlControls;
 10 using System.Web.UI.WebControls;
 11 using System.Web.UI.WebControls.WebParts;
 12 using System.Xml.Linq;
 13 using System.Data.SqlClient;
 14 using MS.DBUtility;
 15 using WebValidates;
 16 
 17 namespace myASUS
 18 {
 19     public partial class loadin : System.Web.UI.Page
 20     {
 21         string connStr = ConfigurationManager.ConnectionStrings["asusconnstr"].ConnectionString;
 22 
 23         protected void Page_Load(object sender, EventArgs e)
 24         {
 25             //页面进行回发，IsPostBack为true 
 26             //页面第一次加载，IsPostBack为false 
 27             if (!Page.IsPostBack)
 28             {
 29                 //如果页面第一次加载，读取Cookie里面存储的用户名，并显示
 30                 if (Request.Cookies["username"] != null)
 31                 {
 32                    userName.Text= Request.Cookies["username"].Value;
 33                 }
 34                 SerialNumber1.create();
 35                                 
 36             }
 37         }
 38 
 39         protected void btnLoadin_Click(object sender, EventArgs e)
 40         {
 41 
 42             if (SerialNumber1.CheckSN(txtCode.Text.Trim()))
 43             {
 44                 //验证码正确
 45                 //登录验证 访问数据库
 46                 member user;
 47 
 48                 bool loginSuccess = LogIn(userName.Text,pwd.Text, out user);
 49                 if (loginSuccess)
 50                 {
 51                     //登录成功
 52 
 53                     //把当前用户的登录名写入客户端Cookie
 54                     //Request.Cookies["username"].Value = user.LoginId;
 55                     //Request.Cookies["username"].Expires = DateTime.Now.AddYears(1);
 56                     //用上面的方式来写入客户端Cookie会导致一个Bug的出现
 57                     //建议使用下面的方式：
 58 
 59                     //借助HttpCookie对象，写入客户端Cookie
 60                     //HttpCookie cookie = new HttpCookie("username", user.LoginId);
 61                     HttpCookie cookie = new HttpCookie("username");
 62                     cookie.Value = user.membername;
 63                     cookie.Expires = DateTime.Now.AddYears(1);
 64                     Response.Cookies.Add(cookie);
 65 
 66 
 67                     //Session[Session名称]=值;
 68                     Session["CurrentUser"] = user; //CurrentUser: 当前用户
 69 
 70                     //获取HTTP查询字符串（QueryString）    ?ReturnUrl=MyOrders.aspx
 71 
 72                     if (Request.QueryString["ReturnUrl"] != null)
 73                     {
 74                         string url = Request.QueryString["ReturnUrl"];
 75                         Response.Redirect(url);
 76                     }
 77                     else
 78                     {
 79                         Response.Redirect("Default.aspx");
 80                     }
 81                 }
 82                 else
 83                 {
 84                     //登录失败
 85                     Response.Write("<script>");
 86                     Response.Write("    alert('用户名或密码错误！')");
 87                     Response.Write("</script>");
 88                 }
 89             }
 90             else
 91             {
 92                 //验证码不正确
 93                 Response.Write("<script>");
 94                 Response.Write("    alert('验证码错误！')");
 95                 Response.Write("</script>");
 96 
 97                 SerialNumber1.create();
 98                 
 99             }
100 
101         }
102         public bool LogIn(string memberName, string Password, out member validUser)
103         {
104             member user = GetUserByLoginId(memberName);
105             if (user == null)
106             {
107                 validUser = null;//用户名不存在 
108                 return false;
109             }
110 
111             if (user.password==Password)
112             {
113                 validUser = user;
114                 return true;
115             }
116             else
117             {
118                 validUser = null;//密码错误 
119                 return false;
120             }
121         }
122         public member GetUserByLoginId(string memberName)
123         {
124             member user = null;
125             string sql = "SELECT * FROM ASUS WHERE memberName= @memberName";
126 
127             using (SqlDataReader reader = SqlHelper.ExecuteReader(connStr, CommandType.Text, sql, new SqlParameter("@memberName",memberName)))
128             {
129                 if (reader.Read())
130                 {
131                     user = new member();
132 
133                     user.memberId= (int)reader["memberID"];
134                     user.membername= (string)reader["memberName"];
135                     user.password= (string)reader["Password"];
136                     reader.Close();
137                 }
138             }
139             return user;
140         }
141         public bool CheckCN()
142         {
143             string validateCode = Session["validateCode"].ToString();
144             if (this.txtCode.Text != validateCode)
145             {
146                 Response.Write("<script>alert('验证码输入错误，请重新输入！');</script>");
147                 txtCode.Text = "";
148                 return false;
149             }
150             else
151             {
152                 return true;
153             }
154         }
155         protected void btnClear_Click(object sender, EventArgs e)
156         {
157             userName.Text = "";
158             pwd.Text = "";
159         }
160     }
161 }
162 下面是页面代码
163 <body>
164     <form id="form1" runat="server">
165      <div id="login">
166     
167          <div id="top">
168               <div id="top_left"><img src="image/login_03.gif"  alt="#"/></div>
169               <div id="top_center"></div>
170          </div>
171          
172          <div id="center">
173               <div id="center_left"></div>
174               <div id="center_middle">
175                    <div id="user">用 户
176                        <asp:TextBox ID="userName" runat="server"></asp:TextBox>
177                    </div>
178                    <div id="password">密   码
179                    <asp:TextBox ID="pwd" runat="server"></asp:TextBox>
180                    </div>
181                    <div>
182                        <asp:Label ID="lblCode" runat="server" Text="验证码"></asp:Label>
183                        <asp:TextBox ID="txtCode" runat="server"></asp:TextBox>
184                    </div>
185                    <div>
186                        <cc2:SerialNumber ID="SerialNumber1" runat="server">
187                        </cc2:SerialNumber>
188                    </div>
189                    <div id="btn">
190                        <asp:Button ID="btnLoadin" runat="server" Text="登录" onclick="btnLoadin_Click" />
191                        <asp:Button ID="btnClear" runat="server" Text="清空" onclick="btnClear_Click" />
192                    </div>
193               
194               </div>
195               <div id="center_right"></div>         
196          </div>
197          <div id="down">
198               <div id="down_left">
199                   <div id="inf">
200                        <span class="inf_text">版本信息</span>
201                        <span class="copyright">管理信息系统</span>
202                   </div>
203               </div>
204               <div id="down_center"></div>         
205          </div>
206 
207     </div>
208     </form>
209 </body>