c# Reservation System (Appointment Scheduling)

I would like a web application written in c# for asp.net that would allow users to schedule an appointment. When a date and time is chosen by a user, that block of time is locked out and no one can schedule in that time. Users can modify appointment time if any is available. When they modify their appointment, release block of time to other users. - Single Appointment Duration is 3 hrs (admin configurable) - Admin Can specify duration of valid appointments for a Project. E.g "Play Ground Visit for Trade Fair" Project May 1 to September 30. Admin can set available times and able to block times that cannot be selected by users. Admin can edit all appointments. Users need to be authenticated against an ASP.NET membership provider specified in web.config. Show Calendar to user if following function returns true. bool isUserAuthenticated(){} . Currently logged on user will return a global object of the class LoggedOnUser which will have the following properties FirstName, LastName, Address, City, State, ZipCode, AssignedProjects (Enum). - ajaxed - Calendar View - Store Calendar in a database - User must be logged in to schedule an appointment - Booked Time Slot is Grayed Out with Overlay Text: "Reserved" (Current user will see their name in their own booked time slot but with ability to cancel -