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HttpCookie.Expires Property

.NET Framework 4

Gets or sets the expiration date and time for the cookie.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)
C#
C++
F#
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public DateTime Expires { get; set; }

Property Value

Type: System.DateTime
The time of day (on the client) at which the cookie expires.

The following code example sets the expiration time of the cookie to 10 minutes from the current time.

C#
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MyCookie.Expires = DateTime.Now.AddMinutes(10.0);

.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.
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Annotations FAQ
Session cookie if Expires not set ?
The cookie remains a session cookie (a cookie that disappears when the user closes his browser) as long as the Expires property is not set, and becomes a persistent cookie once Expires property is set. And there is no way to reset to Expires property. Correct ? $0$0 $0 $0ANSWER: According to the internals, setting Expires to DateTime.MinValue will "reset" it.$0
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Expiration -- Not Set on Request
It would be good to note here (or add a cross reference) that .Expires is not initialized when a browser makes a request.   
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