[InvalidOperationException: 超时时间已到。超时时间已到，但是尚未从池中获取连接。出现这种情况可能是因为所有池连接均在使用，并且达到了最大池大小。]
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +424
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +312
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +202
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +413
   System.Data.SqlClient.SqlConnection.Open() +128
   ZhaoYang.RD.CommonService.Config.ConfRepository.OpenConnection(String connectionStr) in G:\workspace\code\commonsystem\trunk\ZhaoYang.RD.CommonService\Config\ConfRepository.cs:24
   ZhaoYang.RD.CommonService.Config.ConfRepository.OpenConnection() in G:\workspace\code\commonsystem\trunk\ZhaoYang.RD.CommonService\Config\ConfRepository.cs:30
   ZhaoYang.RD.CommonService.Config.ConfRepository.ListByGroupName(ConfQuery query) in G:\workspace\code\commonsystem\trunk\ZhaoYang.RD.CommonService\Config\ConfRepository.cs:113
   ZhaoYang.RD.CommonService.Config.ConfigService.loadConfigs() in G:\workspace\code\commonsystem\trunk\ZhaoYang.RD.CommonService\Config\ConfigService.cs:35
   ZhaoYang.RD.CommonService.Config.ConfigService..ctor(String groupName) in G:\workspace\code\commonsystem\trunk\ZhaoYang.RD.CommonService\Config\ConfigService.cs:27
   ZhaoYang.CatalogSite.Web.UI.MvcApplication.Application_Start() in G:\workspace\code\membersite\trunk\ZhaoYang.CatalogSite.Web.UI\Global.asax.cs:37[HttpException (0x80004005): 超时时间已到。超时时间已到，但是尚未从池中获取连接。出现这种情况可能是因为所有池连接均在使用，并且达到了最大池大小。]
   System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context, HttpApplication app) +520
   System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext, HttpContext context, MethodInfo[] handlers) +176
   System.Web.HttpApplication.InitSpecial(HttpApplicationState state, MethodInfo[] handlers, IntPtr appContext, HttpContext context) +165
   System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext, HttpContext context) +267
   System.Web.Hosting.PipelineRuntime.InitializeApplication(IntPtr appContext) +341[HttpException (0x80004005): 超时时间已到。超时时间已到，但是尚未从池中获取连接。出现这种情况可能是因为所有池连接均在使用，并且达到了最大池大小。]
   System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +523
   System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext context) +107
   System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest wr, HttpContext context) +688