System.Data.SqlClient.SqlException (0x80131904): 建立連接至 SQL Server 時，發生網路相關或執行個體特定的錯誤。找不到或無法存取伺服器。確認執行個名稱是否正確，以及 SQL Server 是否設定為允許遠端連線。 (provider: Named Pipes Provider, error: 40 - 無法開啟至 SQL Server 的連接) ---> System.ComponentModel.Win32Exception (0x80004005): 找不到網路路徑。
   於 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   於 System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)
   於 System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
   於 System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)
   於 System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)
   於 System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)
   於 System.Data.SqlClient.SqlConnection.Open()
   於 System.Data.Linq.SqlClient.SqlConnectionManager.UseConnection(IConnectionUser user)
   於 System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe()
   於 System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode()
   於 System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   於 System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
   於 Hamastar.Business.Object.Comm_Sites.GetSiteSN(String ContentPath)
   於 CustomIHttpHandler1.ProcessRequest(HttpContext context)
ClientConnectionId:00000000-0000-0000-0000-000000000000
Error Number:53,State:0,Class:20