Try the online demo:
AJAX-style event creating, moving, resizing, and deleting
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Context menu
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Day view
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Work week view
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Week view
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Month view
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Horizontal/vertical resources view
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PostBack/AJAX/JavaScript event handling
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Binding to XmlDataSource, SqlDataSource, DataTable, ArrayList
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Custom event formatting
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UpdatePanel compatibility
Calendar Lite Tutorial
DayPilot Pro is an advanced DayPilot edition. You can check a thumbnail overview of the most interesting features. There is also an online demo with all the features working (including the AJAX features). If you want to test the design-time support and API you can download a fully functional trial version. And if you like it, you can buy a full version with source code and 12 months of upgrades and support (with a 30-days money back guarantee).
DayPilot Lite is a do-it-yourself open-source edition of DayPilot. Although it misses some DayPilot Pro features, there are thousands of developers using it to build calendar, personal scheduling, and resource booking applications.