Greetings! As you may noticed, in most GroupDocs.Viewer for .NET sample projects, target Documents are presented in the form of files. They are usually placed in the “testfiles” folder, which is specified in the Global.asax. So you might think that GroupDocs.Viewer can work with files only. But this is not true - GroupDocs.Viewer can also load Documents from byte streams (System.IO.Stream). Moreover, there are no limitations on the type of stream: whether it’s a FileStream, a MemoryStream or a NetworkStream - GroupDocs....NET sample projects, target documents are presented in the form...GroupDocs.Viewer can also load documents from byte streams ( System...