Specifies the number of minutes after the last-activity date/time stamp for a user during which the user is considered online.
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The Membership.UserIsOnlineTimeWindow property value is checked during the call to Membership.GetNumberOfUsersOnline. If the MembershipUser.LastActivityDate for a user is greater than the current date and time minus the Membership.UserIsOnlineTimeWindow value in minutes, then the user is considered online. You can determine whether a membership user is considered online with the MembershipUser.IsOnline property of the System.Web.Security.MembershipUser class.
The MembershipUser.LastActivityDate for a user is updated when a user's credentials are successfully validated by the Membership.ValidateUser(string, string) method. You can also update the MembershipUser.LastActivityDate for a membership user when you call one of the Membership.GetUser overloads. If you call a Membership.GetUser overload that takes a userIsOnline parameter, specify a value of true to update the MembershipUser.LastActivityDate for the user.