Digital Negative Specification (.dng) is a digital camera image format used for the storage of raw files. It has been developed by Adobe in September 2004. It was basically developed for digital photography.
Learn more about this file format here
GroupDocs.Viewer (in GroupDocs.Viewer.dll) Version: 20.6
public static readonly FileType DNG
Public Shared ReadOnly DNG As FileType
static initonly FileType^ DNG