System.ArgumentException: Parameter is not valid.
at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format)
at System.Drawing.Bitmap..ctor(Int32 width, Int32 height)
at ZedGraph.Web.ZedGraphWeb.CreateGraph(Stream OutputStream, ImageFormat Format, Boolean bShowTransparency)
at ZedGraph.Web.ZedGraphWeb.Render(HtmlTextWriter output)
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