Hi Can I please ask you to elaborate on your approach? For example provide an example. I tried this: XmlDocument d = new XmlDocument(); d.Load("XmlData2.xml"); var tmp = d.SelectSingleNode("//xx\[@atty='3' and @attz='0'\]/\*\[name()='min' or name()='max'\]"); //var tmp = d.SelectSingleNode("//xx\[@atty='3' and @attz='0'\]/\*\[name()='min'\]"); but I don't get the right values when inspecting the tmp variable. Thanks

There is nothing much special about the panel, except it should be a DoubleBufferedPanel. I know of three ways to get it on the Form: 1. make sure that class is already compiled (maybe in a separate DLL) and you can design it in with Visual Designer. This is the official approach. 2. or add a Panel with Visual Designer, close the Form, and edit the form.designer.cs file changing new Panel() into new DoubleBufferedPanel() (not recommended, one isn't supposed to edit a designer file) 3. or add a Panel with Visual Designer, and have it replaced at run-time. That is what I did, like so, in the Form's constructor. Panel oldPlot=plot; plot=new DoubleBufferedPanel(); plot.Bounds=oldPlot.Bounds; Controls.Remove(oldPlot); Controls.Add(plot); plot.Paint+=plotter; The disadvantage is you have to copy all Designer properties/events from the old to the new Panel. The alternative is to leave the Panel, and turn it into a double-buffered one by setting some ControlStyles (the DoubleBuffered property being protected cannot be modified). :) Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

My plotting Panel is perfectly smooth, however I can't compare, I never do it the Form way, as 1) it isn't really object-oriented 2) too many things probably are going on with Forms. :) Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

bimbambumbum wrote: BitmapCanvas.Visible = false; hover BitmapCanvas, right-click for "Go to definition" and see if that is what you expect it to be. :) Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles] Nil Volentibus Arduum Please use <PRE> tags for code snippets, they preserve indentation, and improve readability.

Hi Luc Thanks for your support. I managed to get the FFT working as I found a P/invoke FFTW project I could "borrow" from. I appreciate that you spend time writting your reply to me. Will take a look at your article and try get familiar with P/Invoke. Thanks again Tom

Yeah that did it! Thanks...hmmmm, I have a looooong way to go! Thanks Tom

this.invalidate() works as well Regards, Thomas Stockwell Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning. Visit my Blog