Web Forms :: How To Build A Event Based Calendar

I want to build a event based calendar .. sorting by mnth,week,day.... also a calendar to display tasks..

For tat i have a masterpage with calendar usercontrol with tasks... and content page with calendar usercontrol with events Now content page displays both calendar with events and with tasks.

Now when i navigate calendar with events ....the calendar with tasks shuld also navigate to same mnth.

for tat i have used public properties in master page to set values to calendar tasks.

and in content page am setting values to properties in master page usign calendar events properties.

am updating the values even on selection changed and visible mnth changed events.

The problem is tat am facing problems with the synchronizing..

i.e if calendar tasks is always having the previous value of calendar events.

Is there any way to synchronize them?