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Wasn't that easy to dispose the Image, since this

this.pb_map.Image = img;
img.dispose() does not only dispose the img alone but since its referenced also by the pictureBox.Image which still is...

Well...at first:
I did use the search function and yes, I found tons of related posts and threads but in none of them I could find my answer.

Now about the problem:
I try to do some kind of...