Application State In ASP.NET Web Forms | State Management | ASP.NET Web Forms

 using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Session_State

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void SubmitButton_Click(object sender, EventArgs e)

        {

            //Session.Add("user",UserTextBox.Text);   //Creating Session First way

            //Session["user"] = UserTextBox.Text; //Creating Session Second way

            Application["user"] = UserTextBox.Text;

            Response.Redirect("WebForm2.aspx");

        }

    }

}

Above File is Session_State\WebForm1.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Session_State

{

    public partial class WebForm2 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            //Usage of Session as shown below

            //if (Session["user"] != null)

            //{

            //    //Response.Write() is used to display Text at Top Left side in browser screen

            //    Response.Write("Welcome " + Session["user"]);

            //}

            //else

            //{

            //    Response.Redirect("WebForm1.aspx");

            //}

            //Usage of Application State as shown below

            if (Application["user"] != null)

            {

                Response.Write("Welcome " + Application["user"].ToString());

            }

            else

            {

                Response.Redirect("WebForm1.aspx");

            }

        }

    }

}

Above File is Session_State\WebForm2.aspx.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Session_State

{

    public partial class WebForm3 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            //Usage of Session as shown below

            //if (Session["user"] != null)

            //{

            //    //Response.Write() is used to display Text at Top Left side in browser screen

            //    Response.Write("Welcome " + Session["user"].ToString());

            //}

            //else

            //{

            //    Response.Redirect("WebForm1.aspx");

            //}

            //Usage of Application State as shown below

            if (Application["user"] != null)

            {

                Response.Write("Welcome " + Application["user"].ToString());

            }

            else

            {

                Response.Redirect("WebForm1.aspx");

            }

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            //Usage of Session as shown below

            //if (Session["user"] != null)

            //{

            //    Session["user"] = null;

            //    Response.Redirect("WebForm1.aspx");

            //}

            //Usage of Application State as shown below

            if (Application["user"] != null)

            {

                Application["user"] = null;

                Response.Redirect("WebForm1.aspx");

            }

        }

    }

}

Above File is Session_State\WebForm3.aspx.cs