“/”应用程序中的服务器错误。

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行 23:         if (Application[Request.Url.Host]==""||Application[Request.Url.Host]==null)
行 24:         {
行 25:         Conn.Open();
行 26:         CityID = Conn.SqlExecuteB("Select Top 1 Convert(varchar,ID) + '|' + Name + '|' + Code + '|' + DomainName+ '|sz5'  From t_city(nolock) Where DomainName = '" + Request.Url.Host + "'");
行 27:         Conn.Close();

[SqlException (0x80131904): 在与 SQL Server 建立连接时出现与网络相关的或特定于实例的错误。未找到或无法访问服务器。请验证实例名称是否正确并且 SQL Server 已配置为允许远程连接。 (provider: TCP 提供程序, error: 0 - 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。)]
   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +428
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +65
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +117
   System.Data.SqlClient.SqlConnection.Open() +122
   MyDll.Main.SQLDB.Open() in C:\Users\Administrator\Documents\Visual Studio 2008\Projects\MyDll\MyDll\MyDll.cs:76
   ASP.global_asax.Session_Start(Object sender, EventArgs e) in e:\web\公交城市版\global.asax:25
   System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +8866884
   System.Web.SessionState.SessionStateModule.CompleteAcquireState() +237
   System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +504
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +66
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155