asp. net Simple implementation of single sign on of SSO

This paper illustrates the simple implementation of single sign-on (SSO) by asp. net. Share it for your reference, as follows:

Single Sign-On (Single Sign On, SSO for short) is one of the most popular solutions for enterprise business integration. SSO enables users to access all application systems that trust each other only by logging in once in multiple application systems

CAS (Central Authentication Service) is a good single sign-on framework for Web applications (developed by Yale University) mainly used for Java Php are interested you can study under.

Here is a simple way to implement single sign-on:

public void SingleUserLogin(string userName){
  // Define key value 
  string key=userName;
  string value=Convert.ToString(Cache[key]);
  if(value==null||value==string.Empty){
   // Definition Cache Expired time 
   TimeSpan span=new TimeSpan(0,0,HttpContext.Current.Session.Timeout,0,0);
 　    // No. 1 1 Insert on the second login 1 User-related cache Value, 
    HttpContext.Current.Cache.Insert(key,key,null,DateTime.MaxValue,span,System.Web.Caching.CacheItemPriority.NotRemovable,null);
    Session["userName"]=userName;
    Response.Redirect("Main.aspx");
  }
  else if(Cache[key].ToString()==key){
    // Repeated landing 
 　    Response.Write("<mce:script type="text/javascript"><!--
 　    alert(' Your account has been logged in !');window.location='login.aspx';
 　    // --></mce:script>");
  }
  else{
  // Cancel the current session Conversation 
    Session.Abandon();
  }
}

Configuring Form Mode in Web Config

<authentication mode="Forms">//mode Value is Forms Validation for defined as a form 
  <forms loginUrl="Mananger/Login.aspx" name=".ASPXAUTH">// Users access first without logging in Mananger/Login.aspx Page 
 </forms>
</authentication>
<authorization>
 <deny users="?"/>
</authorization>

I hope this article is helpful to everyone's asp. net programming.