未将对象引用设置到对象的实例。

[NullReferenceException: 未将对象引用设置到对象的实例。] ASP.fzhn_thread_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in e:\website\fzhnw\fzhn\Thread.aspx:22 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +256 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19 System.Web.UI.Page.Render(HtmlTextWriter writer) +29 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266