Is it possible to add multiple CalendarInfo to a Gantt Chart.
For example I have many tasks that can run on different time span.
Sorry, I still can't understand what you are trying to do. UltraGanttView was patterned after MS Project, so tasks can have different start/end times if that's what you're talking about. Note that the WinSchedule controls support displaying different calendars (your different resources might be able to fit into that box), althought they display appointments rather than tasks.
Task one can be done anytime, anyday (like a piece drying..)
Task two can be done only between 8am and 5pm
I guess I could just use a generic calendar, but our object model has a calendar for every resource
No, that is not possible. I'm afraid I don't understand your requirement, but if you can clarify exactly what you mean by "run on different time span", we can try to help you.