[NullReferenceException: 未将对象引用设置到对象的实例。]
System.Data.OleDb.OleDbConnection.ValidateTransaction(OleDbTransaction transaction, String method) +18
System.Data.OleDb.OleDbCommand.ValidateConnectionAndTransaction(String method) +40
System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) +56
System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) +116
System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) +4
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +130
System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162
System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +115
DBHelper.GetDataSet(String sql) in f:\usr\localuser\qyw35261\App_Code\DBHelper.cs:70
product.Page_Load(Object sender, EventArgs e) in f:\usr\localuser\qyw35261\product.aspx.cs:18
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627
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