Websites typically use session cookies to ensure
that users are recognized when they move from page to page within one
site and that any information you have entered is remembered. For
example, if an e-commerce site which uses session cookies then items
placed in a shopping cart would appear by the time you reach the
checkout. We will introduce you how to work with the cookies in ASP.NET
2.0 and VB.NET in this tutorial.
Working with cookie in ASP.NET 2.0
Websites typically use session cookies to ensure
that users are recognized when they move from page to page within one
site and that any information you have entered is remembered. For
example, if an e-commerce site which uses session cookies then items
placed in a shopping cart would appear by the time you reach the
checkout. We will introduce you how to work with the cookies in ASP.NET
2.0 and VB.NET in this tutorial.
The browser is responsible for managing cookies on a user
system. Cookies are sent to the browser via the HttpResponse object
that exposes a collection called Cookies. You can access the
HttpResponse object as the Response property of your Page class. Any
cookies that you want to send to the browser must be added to this
collection. When creating a cookie, you specify a Name and Value.
When a browser makes a request to the server, it sends the
cookies for that server along with the request. In this ASP.NET
applications, we can read the cookies using the HttpRequest object,
which is available as the Request property of Page class.
We added one text box, two buttons and 1 label to the web page. The
text box is used for inputting the information of cookie. By clicking
Add button, the sample application will create a new cookie. By
clicking View button, you will see the cookie created. The expiration
date of cookie will be set to 2006-10-1.
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Response.Cookies("MyCookie")("Data") = TextBox1.Text
Response.Cookies("MyCookie")("Time") = DateTime.Now.ToString("G")
Response.Cookies("MyCookie").Expires=DateTime.Now.AddMonths(1)
Label1.Text = "Cookie created!<p>" & "Your cookie
contains:<font color=red>" &
Request.Cookies("MyCookie")("Data") & "<br>" &
Request.Cookies("MyCookie")("Time") & "</font>"
Response.Cookie("MyCookie").Expires=DateTime.FromString("2006-10-1")</p>
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
If (Request.Cookies("MyCookie") Is Nothing) Then
Label1.Text = "There is no cookie:"
Else
Label1.Text
= "Your cookie contains:" & "<font color=red>" &
Request.Cookies("MyCookie")("Data") & "<br>" &
Request.Cookies("MyCookie")("Time") & "</font>"
End If
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The front end Default.aspx page looks something like this:
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<fieldset>
<legend>rdfdf</legend>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Add" Width="70px" />
<asp:Button ID="Button2" runat="server" Text="View" Width="84px" />
<br />
<br />
<asp:Label ID="Label1" runat="server" Text="" Width="138px"></asp:Label>
</fieldset>
</div>
</form>
</body>
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The flow for the code behind page is as follows
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Response.Cookies("MyCookie")("Data") = TextBox1.Text
Response.Cookies("MyCookie")("Time") = DateTime.Now.ToString("G")
Response.Cookies("MyCookie").Expires=DateTime.Now.AddMonths(1)
Label1.Text = "Cookie created!<p>" & "Your cookie
contains:<font color=red>" &
Request.Cookies("MyCookie")("Data") & "<br>" &
Request.Cookies("MyCookie")("Time") & "</font>"
Response.Cookie("MyCookie").Expires=DateTime.FromString("2006-10-1")
End Sub
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button2.Click
If (Request.Cookies("MyCookie") Is Nothing) Then
Label1.Text = "There is no cookie:"
Else
Label1.Text
= "Your cookie contains:" & "<font color=red>" &
Request.Cookies("MyCookie")("Data") & "<br>" &
Request.Cookies("MyCookie")("Time") & "</font>"
End If
End Sub
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