index.aspx
<%@ Page language="c#" Codebehind="4-25.aspx.cs" AutoEventWireup="false" Inherits="study._4_25" %>
<%Response.Write("现在有" + Application["whoson"] + "人在线");%>
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global.asax
<%@ Application Codebehind="Global.asax.cs" Inherits="study.Global" %>
<script language="C#" runat="server">
void Session_OnStart()
{
Application.Lock();
Application["whoson"] = Convert.ToInt32 (Application["whoson"])+1;
Application.UnLock();
}
void Session_OnEnd()
{
Application.Lock();
Application["whoson"] = Convert.ToInt32 (Application["whoson"])-1;
Application.UnLock();
}
public void Application_OnStart()
{
Application.Lock();
Application["whoson"]=0;
Application.UnLock();
}
</script>
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