It is possible that your SQLExpress instance is not running at the location the Sample website expects. You can change the connection string of the database using the DataConfig.config
file located in the App_Data\Sitefinity\Configuration
folder of the SitefinityWebApp solution. The current config looks similar to this:
"Data Source=.\SQLExpress;Integrated Security=True;User Instance=True;AttachDBFilename=|DataDirectory|Sitefinity.mdf"
Note that the connection to the database is explicitly localhost\SQLExpress. Would you try that and let us know if the problem persists?
Thank you for contacting us and we look forward to receiving your early feedback for our new release!
All the best,
the Telerik team
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