RadComboBox for ASP.NET AJAX has a flexible databinding mechanism including support to all ASP.NET 2.0 declarative datasources (ObjectDataSource, XmlDataSource, SqlDataSource, etc.) as well as all datasources introduced in .NET 3.5 (LinqDataSource, EntityDataSource, ADO.NET DataServices, etc). The control can also be bound to web services on the client and load data on demand which results in previously unattainable performance improvements.
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