public static class CookieHelper
{
/// <summary>
/// Checks whether a cookie exists.
/// </summary>
/// <param name="cookieCollection">A CookieCollection, such as Response.Cookies.</param>
/// <param name="name">The cookie name to delete.</param>
/// <returns>A bool indicating whether a cookie exists.</returns>
public static bool Exists(this HttpCookieCollection cookieCollection, string name)
{
if (cookieCollection == null)
{
throw new ArgumentNullException("cookieCollection");
}
return cookieCollection[name] != null;
}
}
Usage:
Request.Cookies.Exists("MyCookie")