Server Error in '/' Application.

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Line 54:         string strwhere = "parentid=1 and menuid=" + categoryid;
Line 55:         DataSet ds;
Line 56:         ds = ProductBLL.GetList(strwhere);
Line 57:         Rep_BusinessList.DataSource = ds;
Line 58:         Rep_BusinessList.DataBind();

[Exception: 不能使用 ''；文件已在使用中。]
   DbHelperOleDb.Query(String SQLString) in J:\2017-12\金莎9159游艺场\金莎9159游艺场\52新双语\DBUtility\DbHelperOleDb.cs:146
   ZZY.DAL.xp_procategory.GetList(String strWhere) in J:\2017-12\金莎9159游艺场\金莎9159游艺场\52新双语\DAL\xp_procategory.cs:291
   ZZY.BLL.xp_procategory.GetList(String strWhere) in J:\2017-12\金莎9159游艺场\金莎9159游艺场\52新双语\BLL\xp_procategory.cs:88
   _Default.NewsBind() in d:\ekemWeb\ekemWeb\caselist.aspx.cs:56
   _Default.Page_Load(Object sender, EventArgs e) in d:\ekemWeb\ekemWeb\caselist.aspx.cs:45
   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) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207