AJAX Date Picker is a free ASP.NET 2.0 calendar control that utilizes AJAX techniques to get data from the server without an entire page postback. You can specify the clickable dates on a given month as well as other days like holidays, etc. A great

XPath, the XML Path Language, is a query language for selecting nodes from an XML document. In addition, XPath may be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document