[HttpException (0x80004005): 在主版頁面 '/EXAM/Main.master' 中找不到 ContentPlaceHolder 'MainContent',請在內容頁面中檢查內容控制項的 ContentPlaceHolderID 屬性。]
System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +603
System.Web.UI.Page.get_Master() +56
System.Web.UI.Page.ApplyMasterPage() +15
System.Web.UI.Page.PerformPreInit() +54
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +302
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