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HttpCookie Class

.NET Framework 4

Provides a type-safe way to create and manipulate individual HTTP cookies.

System.Object
  System.Web.HttpCookie

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)
C#
C++
F#
VB
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public sealed class HttpCookie

The HttpCookie type exposes the following members.

  Name Description
Public method HttpCookie(String) Creates and names a new cookie.
Public method HttpCookie(String, String) Creates, names, and assigns a value to a new cookie.
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  Name Description
Public property Domain Gets or sets the domain to associate the cookie with.
Public property Expires Gets or sets the expiration date and time for the cookie.
Public property HasKeys Gets a value indicating whether a cookie has subkeys.
Public property HttpOnly Gets or sets a value that specifies whether a cookie is accessible by client-side script.
Public property Item Gets a shortcut to the HttpCookie.Values property. This property is provided for compatibility with previous versions of Active Server Pages (ASP).
Public property Name Gets or sets the name of a cookie.
Public property Path Gets or sets the virtual path to transmit with the current cookie.
Public property Secure Gets or sets a value indicating whether to transmit the cookie using Secure Sockets Layer (SSL)--that is, over HTTPS only.
Public property Value Gets or sets an individual cookie value.
Public property Values Gets a collection of key/value pairs that are contained within a single cookie object.
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  Name Description
Public method Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
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The HttpCookie class gets and sets properties of individual cookies. The HttpCookieCollection class provides methods to store, retrieve, and manage multiple cookies.

ASP.NET includes two intrinsic cookie collections. The collection accessed through the Cookies collection of the HttpRequest object contains cookies transmitted by the client to the server in the Cookie header. The collection accessed through the Cookies collection of the HttpResponse object contains new cookies created on the server and transmitted to the client in the Set-Cookie HTTP response header.

Topic Location
How to: Write a Cookie Building ASP .NET Web Applications
How to: Write a Cookie Building ASP .NET Web Applications

The following code example demonstrates how to check for a cookie named DateCookieExample in the HttpRequest object. If the cookie is not found, it is created and added to the HttpResponse object. The cookie is set to expire in 10 minutes.

C#
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<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

    protected void Page_Load(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        // Get cookie from the current request.
        HttpCookie cookie = Request.Cookies.Get("DateCookieExample");

        // Check if cookie exists in the current request.
        if (cookie == null)
        {
            sb.Append("Cookie was not received from the client. ");
            sb.Append("Creating cookie to add to the response. <br/>");
            // Create cookie.
            cookie = new HttpCookie("DateCookieExample");
            // Set value of cookie to current date time.
            cookie.Value = DateTime.Now.ToString();
            // Set cookie to expire in 10 minutes.
            cookie.Expires = DateTime.Now.AddMinutes(10d);
            // Insert the cookie in the current HttpResponse.
            Response.Cookies.Add(cookie);
        }
        else
        {
            sb.Append("Cookie retrieved from client. <br/>");
            sb.Append("Cookie Name: " + cookie.Name + "<br/>");
            sb.Append("Cookie Value: " + cookie.Value + "<br/>");
            sb.Append("Cookie Expiration Date: " + 
                cookie.Expires.ToString() + "<br/>");
        }
        Label1.Text = sb.ToString();
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>HttpCookie Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:Label id="Label1" runat="server"></asp:Label>
    </div>
    </form>
</body>
</html>

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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same problem
Yeah  ，  I  encounter the same problem with you
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cookie.Expires.ToString() error
This line of code
sb.Append("Cookie Expiration Date: " + cookie.Expires.ToString() + "<br/>");

produces this "Cookie Expiration Date: 1/1/0001 12:00:00 AM" in my browser. When I look at the actual expiration date though, it's correct though.
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