---
title: "Session in C#"
description: "When we are working with an application on your computer, you open it, do some changes and then you close it. This is much like a Session."
author: "Tom Cruser"
published: 2016-05-06
updated: 2018-03-27
canonical: https://www.mindstick.com/articles/12042/session-in-c-sharp
category: "c#"
tags: ["c#", "session"]
reading_time: 2 minutes
---
# Session in C#
When we are working with an [application](https://www.mindstick.com/articles/12824/calculator-application-in-android) on [your computer](https://www.mindstick.com/articles/13023/choosing-the-best-power-cord-for-your-computer-a-layman-s-guide), you open it, do some changes and then we close it. This is much like a Session. The computer knows who you are. It knows when we open the application and when we close it. However, on the internet there is one problem: the [web server](https://www.mindstick.com/articles/23199/digital-personal-server-the-premium-web-server) does not know who we are and what we do, because the HTTP address doesn't maintain state.
ASP solves this problem by creating a unique cookie for each user. The cookie is sent to the user's computer and it contains information that identifies the user. This [interface](https://www.mindstick.com/articles/12036/interface-in-c-sharp) is called the [Session object](https://www.mindstick.com/forum/2365/session-object-in-mvc).
The Session [object stores](https://www.mindstick.com/interview/34321/can-you-separate-concerns-using-multiple-object-stores-efficiently-when-would-you-avoid-that) information about, or change settings for a user session.
[Variables](https://www.mindstick.com/articles/715/php-variables) stored in Session object hold information about one single user, and are available to all pages in one application. Common [information stored](https://answers.mindstick.com/qa/51523/does-the-iphone-support-filevault-is-information-stored-on-the-iphone-encrypted-and-password-protected-does-it-have-biometric-capabilities) in [session variables](https://www.mindstick.com/forum/267/session-variables) is name, id, and preferences. The server creates a new Session object for each new user, and destroys the Session object when the session expires.
**Example:** below provided a complete [source code](https://www.mindstick.com/forum/23271/is-there-a-way-to-get-the-source-code-from-an-apk-file) on Session.
**LoginSession.aspx file**\
```
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="LoginSession.aspx.cs" Inherits="LoginSession" %>
```
**LoginSession.aspx.cs file**\
```
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls; public partial class LoginSession : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { } protected void btnLogin_Click(object sender, EventArgs e) { // Create new session variable named "username" Session["username"] = txtUserName.Text; Response.Redirect("SessionStart.aspx"); }}
```
## \
**SessionStart.aspx file**\
```
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SessionStart.aspx.cs" Inherits="SessionStart" %>
```
## \
**SessionStart.aspx.cs file**\
```
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls; public partial class SessionStart : System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { if (Session["username"] != null) { lbl1.Text = "Welcome " + Session["username"].ToString(); } }}
```
---
Original Source: https://www.mindstick.com/articles/12042/session-in-c-sharp
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