by Saranya Mahesh
Upload PDF, save file name to database, save pdf to a folder, create a thumbnail image of pdf and save it to a folder, and also save the image to database
by Retired Author
Image class which contains an array of unique colors with counts used to sort by color and find duplicates.
by H. S. Masud
WrapPanel doesn't support virtualization. But we can improve the performance by simulating virtualization.