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A Beginner's guide for Understanding and Implementing Cookies in ASP.NET

, 16 Jul 2012
This article discuss the basics of cookies. The article talks about what are cookies, why are they required, how they can be implemented in ASP.NET and what could be the possible/probable problems while using Cookies.
cookiesDemo.zip
cookiesDemo
App_Data
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //let us check if the cookie for username exist or not
        if (Request.Cookies["UName"] != null)
        {
            Label1.Text = Request.Cookies["UName"].Value;
        }
        else
        {
            Label1.Text = "Guest";
        }

        //Let us check if the time of last visit exist or not        
        if (Request.Cookies["LVisit"] != null)
        {
            Label2.Text = Request.Cookies["LVisit"].Value;
        }
        else
        {
            Label2.Text = "Never";
        }

        if (IsPostBack == false)
        {
            // Whenever user visit this page or move away from the page lets write the cookie 
            // that tracks the last visit time

            HttpCookie cookie = new HttpCookie("LVisit");

            cookie.Value = DateTime.Now.ToString();
            cookie.Expires = DateTime.Now.AddDays(1);
            Response.Cookies.Add(cookie);
        }
    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        HttpCookie cookie = new HttpCookie("UName");

        cookie.Value = TextBox1.Text;
        cookie.Expires = DateTime.Now.AddDays(1);
        Response.Cookies.Add(cookie);
        Label1.Text = TextBox1.Text;
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Rahul Rajat Singh
Software Developer (Senior)
India India
I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.
  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4
 
If you like my articles, please visit my website for more: www.rahulrajatsingh.com[^]
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Web02 | 2.8.140827.1 | Last Updated 16 Jul 2012
Article Copyright 2012 by Rahul Rajat Singh
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