private PosDataContext(bool disableProxy = false)
     : base(PosDataContextConnectionString.GetConnectionString())
 {
     if (disableProxy)
     {
         Configuration.ProxyCreationEnabled = false;
     }
 }
 public PosDataContextDbConfiguration()
 {
     SetProviderServices(SqlCeProviderServices.ProviderInvariantName, SqlCeProviderServices.Instance);
     SetDefaultConnectionFactory(new SqlCeConnectionFactory("System.Data.SqlServerCe.4.0", "", PosDataContextConnectionString.GetConnectionString()));
 }