[InvalidOperationException: ExecuteScalar: CommandText 属性尚未初始化]
System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +2540053
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) +119
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +65
System.Data.SqlClient.SqlCommand.ExecuteScalar() +189
Food_Industry_Association.WebForm10.BindDate() in E:\visual studio 2010\Projects\Food Industry Association\Food Industry Association\Exhibition.aspx.cs:60
Food_Industry_Association.WebForm10.Page_Load(Object sender, EventArgs e) in E:\visual studio 2010\Projects\Food Industry Association\Food Industry Association\Exhibition.aspx.cs:40
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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