Server Side Technique(Managing state)

1) Session State

Session state objects are created when a user request for the ASP.NET when the session state it turned on. Session objects are created different for all the new requests. It can work across all the pages that means we can access the session object in all the pages. This was not possible with viewstate variables.. It is mainly used to store user details like login name. It can also be used to store shopping cart details, customer details etc.

  Session objects consists of session ID's which is uniques for each new requests. Session ID objects are created from HttpSessionState class.

Bydefault, an ASP.NET session state is enabled for all ASP.NET applications. Session variables are called server side technique because they are stored in the web server memory.

In short we can say, session variables are single-user global data stored on the web server which can be accessed across all the web pages.

Let us look at the same example used in viewstate.

Design 

SessionState.aspx page

In this the change i have done is the submit button which will redirect to a new page(i.e. NewPage.aspx). This will help us to show whether it is accessible across all the pages.

NewPage.aspx page

Code Behind

 SessionState.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace httpstateless
{
    public partial class SessionState : System.Web.UI.Page
    {
        string name, blog;
        protected void Page_Load(object sender, EventArgs e)
        {
           
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            name = TextBox1.Text;
            blog = TextBox2.Text;
            TextBox1.Text = "";
            TextBox2.Text = "";
            Session["name"] = name;
            Session["blog"] = blog;
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            TextBox1.Text = Convert.ToString(Session["name"]);
            TextBox2.Text = Convert.ToString(Session["blog"]);
        }

        protected void Button3_Click(object sender, EventArgs e)
        {
            Response.Redirect("NewPage.aspx");
        }
    }
}

NewPage.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace httpstateless
{
    public partial class NewPage : System.Web.UI.Page
    {
        string name, blog;
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            name = TextBox1.Text;
            blog = TextBox2.Text;
            TextBox1.Text = "";
            TextBox2.Text = "";
            Session["name"] = name;
            Session["blog"] = blog;
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            TextBox1.Text = Convert.ToString(Session["name"]);
            TextBox2.Text = Convert.ToString(Session["blog"]);
        }
    }
}

Output

 After entering the details click on save button to save the content in session state variables. You may use the restore button to check whether it is working fine. After that click on submit button to move to the new page.

In the new page click on restore button to restore the content from the session state variable and it will work fine as session state variables can be accessed across pages.

NewPage.aspx page

After clicking on restore button.

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