[InvalidOperationException: 可为空的对象必须具有一个值。]
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
System.Nullable`1.get_Value() +23
ASP.arcinfo_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in d:\wwwroot\hzhrzl\wwwroot\arcinfo.aspx:59
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +117
System.Web.UI.Page.Render(HtmlTextWriter writer) +39
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +79
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +8753
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