APPLICATION STATE IN ASP.NET BY ANIL KUMAR

                               APPLICATION STATE

     IF WE TAKE THE EXAMPLE OF NEWS LIVE CRICKET SCORE WEBSITES IN OUR SITED WE ALWAYS SEE THE UPDATED RESULTS.  BUT BASICALLY IT IS NOT OWNSELF UPDATE,

    SOME ONE IS UPDATING THEM . WE ALL OVER THE WORLD WATCHING THEM

                                                             

                                                                   SO WE CAN DO THIS BY SESSION STATE MANAGEMENT TECHNIQUE, BECAUSE SESSION ALWAYS CREATE A NEW SESSION ID OBJECT FOR A NEW CLIENT

 

                                                                                                                                                    

        SO TO OVERCOME THESE TYPE OF PROBLEM      WE USE APPLICATION STATE MANAGEMENT TECHNIQUE

                             APPLICATION STATE ALLOWS YOU TO STORE GLOBAL OBJECT THAT CAN BE ACCESSED BY ANY CLIENT. APPLICATION STATE IS BASE ON THE SYSTEM.WEB.HTTPAPPLICATION.STATE   CLASS WHICH IS PROVIDING IN ALL WEB PAGE THROUGH THE BUILD IN APPLICATION OBJECT

                                                                  APPLICATION STATE IS SIMILAR TO SESSION STATE. IT SUPPORTS THE SAME TYPE OF OBJECT, RETAIN INFORMATION ON SERVER AND USE THE SAME DICTIONARY-BASED SYNTAX, ONLY THE DIFFERENCE IS THAT HERE APPLICATION STATE OBJECT IS CREATED ONCE AND SHARED BY MULTIPLE USERS

1.   HERE WE MANGE THE STATE AT SERVER SIDE

2.   THIS IS AN SINGLE INSTANCE IN FULL WEBSITED, IT IS LOADED IN MEMORY AT ONE TIME LIKE STATIC VARIABLE, MEMORY IS AVAILABLE TILL YOUR PAGE IS OPENED WHEN YOU CLOSE IT THAN IT IS FREE MEMORY

3.   APPLICATION OBJECT IS CREATED WHEN THE SITE IS LOADED AND AN EVENT IF FIRED APPLICATION START,

4.    THIS OBJECT IS AVAILABLE TILL THE SITE IS STOPPED, NO DUPLICATE COPY OF THIS OBJECT CAN NOT BE CREATED

5.      IF WE WANT TO ACCESS OUR INFORMATION ALL OVER THE WORLD BY ANY CLIENT, SO ADD YOUR INFORMATION IN THIS OBJECT

                                                     PRACTICAL

       ADD A GLOBAL APPLICATION CLASS

   ADD NEW ITEM        GLOBAL APPLICATION CLASS

   

<%@ Application Language="C#" %>

<script runat="server">

    void Application_Start(object sender, EventArgs e)

    {

        Application.Add("news", "arun is not going in new york");

    }

   

    void Application_End(object sender, EventArgs e)

    {

        //  Code that runs on application shutdown

    }

       

    void Application_Error(object sender, EventArgs e)

    {

        // Code that runs when an unhandled error occurs

    }

    void Session_Start(object sender, EventArgs e)

    {

        // Code that runs when a new session is started

    }

    void Session_End(object sender, EventArgs e)

    {

        // Code that runs when a session ends.

        // Note: The Session_End event is raised only when the sessionstate mode

        // is set to InProc in the Web.config file. If session mode is set to StateServer

        // or SQLServer, the event is not raised.

    }

      

</script>

      

                           ON DEFAULT.ASPX ( NEWS UPDATER PAGE)

         }

    protected void Button1_Click(object sender, EventArgs e)

    {

        Application.Set("news", TextBox1.Text);

        Response.Redirect("Default2.aspx");

        Application.Add("news", TextBox1.Text);

       

    }

        On DEFAULT2. ASPX    ( CLIENT SIDE TO SEE NEWS);

        

    protected void Page_Load(object sender, EventArgs e)

    {

        Response.Write(Application["news"].ToString() + "<br/>");

    }