Ref Url, https://github.com/DevExpress-Examples/aspximagegallery-how-to-add-a-watermark-to-images-t446207 DevExpress-Examples/aspximagegallery-how-to-add-a-watermark-to-images-t446207 .NET, ASP.NET Web Forms, Navigation, Layout & Multi-Purpose Controls - DevExpress-Examples/aspximagegallery-how-to-add-a-watermark-to-images-t446207 github.com https://www.devexpress.com/Support/Center/Question/Det..