SizeMode
Normal – image is positioned in the upper-left corner of the PictureBox, and any part of the image that is too big for the PictureBox is clipped.
StretchImage – image will stretch or shrink to fit the PictureBox.
Zoom – the image will be stretched or shrunk to fit the PictureBox but the aspect ratio in the original is maintained.
AutoSize – the control will resize to always fit the image.
CenterImage – the image will be centered in the client area.
Feel free to comment if you can add help to this page or point out issues and solutions you have found. I do not provide support on this site, if you need help with a problem head over to stack overflow.