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Check this [demo](http://scheduler-net.com/demo.aspx) (check the month view). This web control is coded in C# with SQL Server backend, as required.

You can try a ready solution implemented with [DHTMLX Scheduler .NET](http://www.scheduler-net.com/) Here is a [demo](http://booking-app.scheduler-net.com/).

you can schedule your tasks with Scheduler .NET Have a look at this [URL="http://scheduler-net.com/docs/tutorialstask_manager.html"]detailed tutorial[/URL].