Asp.Net_单点登录

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using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls;   public partial class _Default : System.Web.UI.Page {     protected void Page_Load(object sender, EventArgs e)     {         if (Application["UsName"] != null)         {             Response.Write("记录的用户名：" + Application["UsName"]);         }     }     /// <summary>     /// 登录     /// </summary>     /// <param name="sender"></param>     /// <param name="e"></param>     protected void OnloginbtnClick(object sender, EventArgs e)     {         if (txt_UsName.Text.Length > 0 && txt_UsPwd.Text.Length > 0)         {             if (Application["UsName"] != null)             {                 //判断用户是否已经登录过                 string[] UsNameArray=Application["UsName"].ToString().Split(',');                 for (int i = 0; i < UsNameArray.Length; i++)                 {                     if (UsNameArray[i] == txt_UsName.Text.Trim())                     {                         Response.Write("<script>alert('你已经登录!');</script>");                         return;                     }                 }             }                 string strSplit = "";                 Session["loginUsName"] = txt_UsName.Text.Trim();                 Application.Lock();                 if (Application["UsName"] != null)                 {                     strSplit = ",";                 }                 Application["UsName"] = Application["UsName"] + strSplit + Session["loginUsName"].ToString();                 Application.UnLock();                   Response.Write("<script>alert('成功登录!');</script>");         }         else         {             Response.Write("<script>alert('请填写用户名和密码!');</script>");         }     }       /// <summary>     /// 退出登录     /// </summary>     /// <param name="sender"></param>     /// <param name="e"></param>     protected void OnSignOutBtnClick(object sender, EventArgs e)     {         if (Session["loginUsName"] != null)         {             Application.Lock();             Application["UsName"] = Application["UsName"].ToString().Replace(Session["loginUsName"].ToString(), "");             Application.UnLock();             Response.Write("<script>alert('" + Session["loginUsName"] + "已经成功退出" + "!');</script>");         }     } }

　　  void Application_Start(object sender, EventArgs e) 

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{     //在应用程序启动时运行的代码     Application["UsName"] = null;        }