Several ways to summarize of session for login authentication global control

1. Create a public method in a public class and then call it on any page that needs to be validated
// In this case, call the CheckLogin () method in the entry function;

  public static string SeUserID
        {
            get
            {
                return HttpContext.Current.Session["SeUserID"].ToString();
            }
            set
            {
                HttpContext.Current.Session["SeUserID"] = value;
            }
        }
        /// <summary>
        ///  Check if the user is logged in, and if not, go to the login page 
        /// </summary>
        public static void CheckLogin()
        {
            if (SeUserID == "" || SeUserID == "0")
            {
                HttpContext.Current.Response.Redirect("ForeignFirms.aspx");
                //HttpContext.Current.Response.Write("<script>window.open('');alert(' Login failed, please login again ');</script>");
            }
        }

// in cs The page invokes the validation method  
    protected void Page_Load(object sender, EventArgs e)
    {
        Commom.CommonFunction.CheckLogin();// Verify login information 
        if (!IsPostBack)
        {
            GetData();
            value = Request.QueryString["id"].ToString();
            if (value != "0")
            {
                GetEdit();
            }
        }
    }

2. Control via Global file

protected void Session_Start(Object sender, EventArgs e)
　　{
　　    Session["sqlConnectionString"] = "uid=Username;pwd=password;database=MyTest;server=Localhost;Connect Timeout=300";
　　} 　　 

-- The method of reading, the application in the code

String strConnection=Session["sqlConnectionString"].ToString();
　　sqlConnection_1=new SqlConnection(strConnection); 

3, via Web.Config file configuration

// The Web. Config file is configured as follows:
Web. Config file < system.web > < /system.web > Add the following code to the node to set the life cycle of Session to 10 minutes.

<sessionState mode="InProc" timeout="10"></sessionState>

When setting Session in the web. config file, you can set the following parameters:

 Mode// This parameter is used to set the state of the storage session. State including Off , Inproc , StateServer and SqlServer . 
Off// Disables session state 
Inproc// Represents the worker process itself stores session state 
StateServer// Indicates that session information will be stored 1 A separate ASP.NET Status service 
SqlServe//r Indicates that session information will be stored SQL Server In the database. 
StateConnecitonString// This parameter is used for setting ASP.NET The name of the server where the application stores the remote session state. The default name is local. 
Cookieless// When the parameter value is set to True when , Means not to use Cookie// Session identification guest , Otherwise set to False when , Logo launch Cookie Session state. 
SqlConnectionString// This parameter is used for setting SQL Server Database connection. 
Timeout// This parameter is used to set the session time beyond which the session will be automatically interrupted. The default is 20 .