As we all know, HTTP is a stateless protocol, it can't hold client information on a page. If the user inserts some information and move to the next page, that data will be lost and the user would not be able to retrieve that information. Session provides a facility to store information on server memory. It can support any type of object to store along with our own custom objects. For every client, session data is stored separately, which means session data is stored on a per client basis.

ASP.NET session state enables you to store and retrieve values for a user as the user navigates ASP.NET pages in a Web application. ASP.NET session state identifies requests from the same browser during a limited time window as a session, and provides a way to persist variable values for the duration of that session.

Advantages of Session:-

1. It helps maintain user state and data all over the application.
2. It is easy to implement and we can store any kind of object.
3. Stores client data separately.
4. Session is secure and transparent from the user.

Example:-

Step 1:-

Design the form as shown below:-

Step 2:-

Write the code in the webform1.aspx.cs

using System;



namespace SessionWebApplication
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protectedvoid Page_Load(objectsender, EventArgse)
        {



        }

        protectedvoid btnSave_Click(objectsender, EventArgse)
        {
            //storing data in Session variable name and city
            Session["Name"] =txtName.Text;
            Session["City"] =txtCity.Text;
            txtName.Text="";
            txtCity.Text="";
            lblMsg.Text="Data saved in session";


        }



    }



}

    <div>
        <asp:Label ID="lblName"runat="server"></asp:Label>
        <br/>
        <asp:Label ID="lblCity"runat="server"></asp:Label>
        <br/>
        <br/>
        <asp:HyperLink ID="HyperLink1" runat="server"NavigateUrl="~/WebForm1.aspx">Back</asp:HyperLink>

    </div> 

using System;
 

namespace SessionWebApplication
{

    public partial class WebForm2 : System.Web.UI.Page
    {
        protectedvoid Page_Load(objectsender, EventArgse)
        {
            //retrieving data from session variable name and city
            lblName.Text="Hi "+Session["Name"].ToString();
            lblCity.Text="You live in "+Session["City"].ToString();

        }

    }

}