[InvalidOperationException: 超時時間已到。超時時間已到，但是尚未從池中獲取連接。出現這種情況可能是因為所有池連接均在使用，并且達到了最大池大小。]
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) +126
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +255
System.Data.SqlClient.SqlConnection.Open() +128
DTcms.DBUtility.DbHelperSQL.PrepareCommand(SqlCommand cmd, SqlConnection conn, SqlTransaction trans, String cmdText, SqlParameter[] cmdParms) in e:\HNRJWEB\DTcms.DBUtility\DbHelperSQL.cs:1012
DTcms.DBUtility.DbHelperSQL.GetSingle(String SQLString, SqlParameter[] cmdParms) in e:\HNRJWEB\DTcms.DBUtility\DbHelperSQL.cs:871
DTcms.DBUtility.DbHelperSQL.Exists(String strSql, SqlParameter[] cmdParms) in e:\HNRJWEB\DTcms.DBUtility\DbHelperSQL.cs:112
DTcms.DAL.article.Exists(Int32 id) in e:\HNRJWEB\DTcms.DAL\article.cs:34
DTcms.BLL.article.Exists(Int32 id) in e:\HNRJWEB\DTcms.BLL\article.cs:27
DTcms.Web.UI.Page.article_show.ShowPage() in e:\HNRJWEB\DTcms.Web.UI\Page\article_show.cs:28
DTcms.Web.UI.BasePage..ctor() in e:\HNRJWEB\DTcms.Web.UI\BasePage.cs:35
DTcms.Web.UI.Page.article_show..ctor() in e:\HNRJWEB\DTcms.Web.UI\Page\article_show.cs:15
ASP.aspx_main_news_show_aspx..ctor() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\7b7ba9e5\565f7b9e\App_Web_wnu5c4ta.1.cs:0
__ASP.FastObjectFactory_app_web_wnu5c4ta.Create_ASP_aspx_main_news_show_aspx() in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\root\7b7ba9e5\565f7b9e\App_Web_wnu5c4ta.17.cs:0
System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp) +132
System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) +44
System.Web.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +375
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +195
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +128
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