TAILIEUCHUNG - ASP.NET 4 Unleased - p 131

Maintaining Application State Delete Cookie The particular date that you specify when deleting a cookie doesn’t matter as long as it is in the past. In Listing , the expiration date is set to one day ago. The page in Listing deletes all cookies sent from the browser to the current domain (and path). LISTING | 1274 CHAPTER 28 Maintaining Application State html xmlns http 1999 xhtml head id Head1 runat server title Delete Cookie title head body form id form1 runat server div asp Label id lblCookieName Text Cookie Name AssociatedControlID txtCookieName Runat server asp TextBox id txtCookieName Runat server asp Button id btnDelete Text Delete Cookie OnClick btnDelete_Click Runat server div form body html The particular date that you specify when deleting a cookie doesn t matter as long as it is in the past. In Listing the expiration date is set to one day ago. The page in Listing deletes all cookies sent from the browser to the current domain and path . LISTING @ Page Language C DOCTYPE html PUBLIC - W3C DTD XHTML Transitional EN http TR xhtml1 DTD script runat server void Page_Load string cookies foreach string cookie in cookies From the Library of Wow eBook Using Browser Cookies 1275 Deleting cookie cookie .Expires -l script html xmlns http 1999 xhtml head id Head1 runat server title Delete All Cookies title head body form id form1 runat server div h1 Delete All Cookies h1 asp BulletedList id BulletedList1 EnableViewState false Runat server div form body html The page in Listing loops through all the cookie names from the collection and deletes each cookie. Working with Multivalued Cookies According to the cookie specifications browsers should not store more than 20 cookies from a single domain. You can work around this limitation by creating multivalued cookies. A multivalued cookie is a single cookie that contains subkeys. You can create as many subkeys as you need. For example the page in Listing creates a multivalued cookie named preferences. The preferences cookie stores a first name last name and favorite color see Figure . 28 From the Library of Wow .

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