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The HtmlDocument.Cookie property of System.Windows.Forms.HtmlDocument exposes all cookies set for a Web page.
A cookie is an arbitrary name/value pair associated with a given Web page. Web developers use cookies to track when users visit or return to a Web site. A cookie is composed of multiple parts, called cookie crumbs, that determine the following:
The document set to which the cookie applies; its domain and path.
The name and value of the cookie.
The expiration date of the cookie.
Whether the cookie can only be sent using a secure connection.
The HtmlDocument.Cookie property may contain multiple cookies.
You can only use the HtmlDocument.Cookie property to set one cookie at a time.