Imagelist Kullanımı. Colordepth property represents the color depth of the image list. If you comment out the lines that cause the exception and the designer loads can you edit the imagelist to see if all 6 images were loaded.

Imagelist c da projemiz için resim saklama ve istediğimizde bu resimleri ulaşma nesnemizdir diyebiliriz en temel anlamda. The sizemode property which is set to values in the pictureboxsizemode enumeration controls the clipping and positioning of the image in the display area. With this approach you would need something like.
If you really need the current index of on image you should use the indexofkey method after adding it to the list with the desired key.
These imagelist objects are added to the largeimagelist and smallimagelist properties. Images property represents all images in an imagelist as an imagecollection object. Image thumbnails are loaded asynchronously with a separate background thread. Gets or sets the imagelist associated with application defined states in the control.