Hi Christian,
I just checked to verify that demo database file is not read-only.
I believe this is a result of the file being locked for some reason, as SQLServer 2008 R2 basically should work normally
Can you load the demos in Visual Studio and try running the project? Does the error happen again? Can you check the Server bar (typically placed near the Toolbox)? Does it have the Northwind database attached?
Kind regards,
Erjan Gavalji
the Telerik team
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