[InvalidCastException: 无法将类型为“System.DBNull”的对象强制转换为类型“System.String”。]
SqlStore.SqlPartGetOfChapter(Int32 chapterId) in d:\wwwroot\qacn_www\wwwroot\App_Code\SqlStore.cs:525
viewchapter2.Page_Load(Object sender, EventArgs e) in d:\wwwroot\qacn_www\wwwroot\viewchapter.aspx.cs:49
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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