--- title: "Cookies in ASP.NET" description: "Cookies are small bit of text that is stored by web servers on to user machine. It contains user related information, example if we want to store re" author: "Anonymous User" published: 2010-07-27 updated: 2020-03-04 canonical: https://www.mindstick.com/articles/40/cookies-in-asp-dot-net category: "asp.net" tags: ["asp.net"] reading_time: 2 minutes --- # Cookies in ASP.NET Cookies are small bit of text that is stored by web servers on to user machine. It contains user related information, example if we want to store record of user who had logged on to the site from specified machine then we can store cookie in that machine. ##### Writing Cookie Here is the code which demonstrates how to write cookie. Response.Cookies["username"].Value = "Mac"; Response.Cookies["userName"].Expires = DateTime.Now.AddDays(1); First line sets the value and second line of the code above sets the expiry date of the cookie. Here it is one day, which can be modified when needed. ##### Reading Cookie ## Here is the code which demonstrates how to read cookie. if (Request.Cookies["username"] != null) lblUsername.Text = "User Name: "+Request.Cookies["username"].Value; In the code above first we are checking whether cookie exist to avoid error raised if cookie does not exist. After checking for cookie existance we read it: Request.Cookies["username"].Value ##### Here is an example to demonstrate the use of cookies ##### ![Cookies in ASP.NET](https://www.mindstick.com/mindstickarticle/c4e253f5-67dc-4211-8a1f-e29c17ce2943/images/5e19cad6-1a10-4ee9-b96a-905b6bc57e67.png)\ ## ##### Design source for above screen shot ```

``` ##### ASP.NET code ## ``` protected void Page_Load(object sender, EventArgs e) { //creating counter to check how many times user has visited page int counter; if (Request.Cookies["counter"]== null) counter= 0; else { counter= int.Parse(Request.Cookies["counter"].Value); } counter++; //writing counter cookie Response.Cookies["counter"].Value = counter.ToString(); Response.Cookies["counter"].Expires = DateTime.Now.AddDays(1); //storing last visit information in cookie Response.Cookies["lastvisit"].Value = lblPrevLogin.Text; //storing user name in cookie Response.Cookies["username"].Value= "Mac"; Response.Cookies["userName"].Expires = DateTime.Now.AddDays(1); //writing last visited details Response.Cookies["lastvisit"].Value = DateTime.Now.ToString(); Response.Cookies["lastvisit"].Expires = DateTime.Now.AddDays(1); //checking for counter cookie and displaying the counter in label if (Request.Cookies["counter"] != null) lblCounter.Text = "Counter: " + Request.Cookies["counter"].Value; //checking lastvisit cookie and displaying it in label if (Request.Cookies["lastvisit"] != null) lblPrevLogin.Text = Request.Cookies["lastvisit"].Value; //checking for color cookie set by the user and changing the backcolor of //lableaccordingly.if (Request.Cookies["color"] != null) { if (Request.Cookies["color"].Value == "Red") lblPrevLogin.BackColor = System.Drawing.Color.Red; else if (Request.Cookies["color"].Value == "Green") lblPrevLogin.BackColor = System.Drawing.Color.Green; else if (Request.Cookies["color"].Value == "Yellow") lblPrevLogin.BackColor = System.Drawing.Color.Yellow; } } ``` ![Cookies in ASP.NET](https://www.mindstick.com/mindstickarticle/c4e253f5-67dc-4211-8a1f-e29c17ce2943/images/a3922f23-206e-4b45-8b63-5210ddf9e64f.png) ``` protected void btnCookie_Click(object sender, EventArgs e) { //displaying user nameand lastvisit information of user if (Request.Cookies["username"] != null) lblUsername.Text = "User Name: "+Request.Cookies["username"].Value; if (Request.Cookies["lastvisit"] != null) lblLastvisit.Text = "Last Visited: "+Request.Cookies["lastvisit"].Value; } ``` ![Cookies in ASP.NET](https://www.mindstick.com/mindstickarticle/c4e253f5-67dc-4211-8a1f-e29c17ce2943/images/267f16cf-ed8e-4750-91ed-0de4dda248fe.png) \ ``` //modifing color cookie and and changing backcolor of label accorgind to //button click protected void btnDefault_Click(object sender, EventArgs e) { Response.Cookies["color"].Value = "Red"; Response.Cookies["color"].Expires = DateTime.Now.AddDays(1); lblPrevLogin.BackColor= System.Drawing.Color.Red; } ``` ![Cookies in ASP.NET](https://www.mindstick.com/mindstickarticle/c4e253f5-67dc-4211-8a1f-e29c17ce2943/images/af0b9c6e-42a9-4352-ac7e-7583f68ff55a.png) ``` protected void btnGreen_Click(object sender, EventArgs e) { Response.Cookies["color"].Value = "Green"; Response.Cookies["color"].Expires = DateTime.Now.AddDays(1); lblPrevLogin.BackColor= System.Drawing.Color.Green; } ``` ![Cookies in ASP.NET](https://www.mindstick.com/mindstickarticle/c4e253f5-67dc-4211-8a1f-e29c17ce2943/images/146a978e-4845-41a1-a85f-c8406ebeb443.png) \ ``` protected void btnYellow_Click(object sender, EventArgs e) { Response.Cookies["color"].Value = "Yellow"; Response.Cookies["color"].Expires = DateTime.Now.AddDays(1); lblPrevLogin.BackColor= System.Drawing.Color.Yellow; } ``` ![Cookies in ASP.NET](https://www.mindstick.com/mindstickarticle/c4e253f5-67dc-4211-8a1f-e29c17ce2943/images/d6f97bdf-30dd-4af8-8953-ae6682685bc2.png)\ --- Original Source: https://www.mindstick.com/articles/40/cookies-in-asp-dot-net Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.