Default.aspx.cs

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using System;
using System.Management;
using System.Web;
using System.Web.Security;
using System.Web.UI;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       if (!IsPostBack)
        {
            //清除cookie
            HttpCookie aCookie;
            string cookieName;
            int limit = Request.Cookies.Count;
            for (int i = 0; i < limit; i++)
            {
                cookieName = Request.Cookies[i].Name;
                aCookie = new HttpCookie(cookieName);
                Response.Cookies.Add(aCookie);
            }

           // 下载于www.51aspx.com
            if (Request.Cookies["username"] != null)
            {
                txtUserName.Value = Server.HtmlEncode(Request.Cookies["username"].Value);
            }

        }
    }

    // 登陆
    protected void btnLogin_Click(object sender, ImageClickEventArgs e)
    {

                string UserName = txtUserName.Value.Trim();
                string Password = txtUserPassword.Value.Trim();            
                //登录验证 
                User myuser = new User();
                myuser.UserName = UserName;
                string sqlGetUserID = "SELECT UserID FROM [User] WHERE UserName='" + UserName + "'";
                int userid = Convert.ToInt16(DbHelperSQL.GetSingle(sqlGetUserID));
                myuser.GetModel(userid);
                if (myuser.Password != null)
                {

                    if (myuser.Password.Trim() == Password)
                        {
                            Role myrole = new Role();
                            myrole.RoleID = Convert.ToInt16(myuser.RoleID);
                            myrole.GetModel(myrole.RoleID);
                            Response.Cookies["roleid"].Value = myrole.RoleID.ToString();
                            Response.Cookies["roleid"].Expires = DateTime.Now.AddHours(24);
                            Response.Cookies["role"].Value = HttpUtility.UrlEncode(myrole.PoleName);
                            Response.Cookies["role"].Expires = DateTime.Now.AddHours(24);
                            Response.Cookies["userid"].Value = userid.ToString();
                            Response.Cookies["userid"].Expires = DateTime.Now.AddHours(24);
                            Response.Cookies["name"].Value = HttpUtility.UrlEncode(myuser.Name);
                            Response.Cookies["name"].Expires = DateTime.Now.AddHours(24);