Team Foundation Server The path is already mapped in workspace

This problem can occur when trying to change the collection a project is mapped to. Its to do with the TFS cache on the local machine. You can resolve the error by deleting the cache files at:

%APPDATA%\Local\Microsoft\Team Foundation\4.0\Cache

If you are using an older version of team foundation server then change the version number to match.

DevExpress how to validate all tabs

separate each page of controls by Validation Group.

Devexpress, how to validate page from javascript

If you have a button, and want to call devexpress validation before doing anything else this can be achieved with the below javascript on the click event of the button.

How to get XNA game studio install working on windows 8

http://blogs.msdn.com/b/astebner/archive/2012/02/29/10274694.aspx