ASP. NET in the AcquireRequestState event to determine the login verification.

Add the AcquireRequestState event to global.

protected voidApplication_acquirerequeststate (Objectsender, EventArgs e) {Uri URL= Request.url;//gets the URL of the current request//access to the Admin directory requires login verification.     if(URL.) Absolutepath.tolower (). StartsWith ("/admin"))    {        //if Login.aspx is written in the admin directory, you need to exclude login.aspx authentication.         if(httpcontext.current.session["Name"] ==NULL) {HttpContext.Current.Response.Redirect ("~/login.aspx"); }    }}

You can also use the IHttpModule interface to create a class that is called under the configuration file.

Don't forget: Configure it in the configuration file.
<add name= "Checkadminmodule" type= "Web.Common.CheckAdminModule"/>

 Public classcheckadminmodule:ihttpmodule{ Public voidInit (HttpApplication context) {context. AcquireRequestState+=NewEventHandler (onacquirerequeststate); }   Public voidOnacquirerequeststate (Objectsender, EventArgs e) {HttpApplication application= Sender asHttpApplication; Uri URL= Application. Request.url;//gets the URL of the current request//access to the Admin directory requires login verification.     if(URL.) Absolutepath.tolower (). StartsWith ("/admin"))    {      //if Login.aspx is written in the admin directory, you need to exclude login.aspx authentication.       if(Application. session["Name"] ==NULL) //httpcontext.current.session["Name"]  {application. Response.Redirect ("~/login.aspx"); }    }  }}

The

ASP. NET determines the login validation in the AcquireRequestState event.