Hi CeeJay,
This is about accessing your SQL Server. Make sure you have access to the server ie: your client PC must be opened by firewall at the SQL Server PC. Also check protocol at SQL Server Configuration Manager.
You can check the access permition by accessing the SQL Server using Microsoft Sql Server Management Studio (SSMS). If you can not access using SSMS, your application can not use the server engine by SlEventManager.mdf. There is nothing wrong with the
SlEvenmanager application.
Welcome to Silverlight world,
Jannen