This website has free tutorials for XML, C# and Java...

It also Provides information about C# portal,java portal,XML portal.

"XML.org serves as an online community gathering place for those interested and involved in XML-related standards and specificationsXML.org advances the use of open standards by providing technical and educational information, collaborative workspaces, and discussion areas.
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Here is help for everything from basic HTML, to CGI-scripts and lots of other useful web related information you might like to know. This is by no means a list of every site out there, just some of what we consider the most useful.