>>>I am wondering if there is a way to autosize an editbox. txtwidth would be a problem, because of the word wrap, but could be possible to get at least close enough and add some additional height. Maybe someone has a better idea?
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>>What are you trying to accomplish?
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>See attached image, it does work to a certain extend, I guess in some situations it may not be perfect.

Christian, I have the feeling that you will find this article answers most of your questions: http://doughennig.com/Papers/Pub/GDIPlusX.pdf
You will find the sample code here: http://doughennig.com/Papers/Pub/GDIPlusXSamples.zip