// For complete examples and data files, please go to https://github.com/groupdocsviewer/GroupDocs_Viewer_NET
//Get Configurations
ViewerConfig config = Utilities.GetConfigurations();
// Create image handler
ViewerHandler<PageImage> handler = new ViewerImageHandler(config);
// Guid implies that unique document name
string guid = DocumentName;
//Initialize ImageOptions Object and setting Rotate Transformation
ImageOptions options = new ImageOptions { Transformations=Transformation.Rotate };
// Set password if document is password protected.
if (!String.IsNullOrEmpty(DocumentPassword))
options.Password = DocumentPassword;
//Call RotatePages to apply rotate transformation to a page
Utilities.PageTransformations.RotatePages(ref handler, guid,1,RotationAngle);
//down cast the handler(ViewerHandler) to viewerHtmlHandler
ViewerImageHandler imageHandler = (ViewerImageHandler)handler;
//Get document pages in image form
List<PageImage> Images = imageHandler.GetPages(guid, options);
foreach (PageImage image in Images)
{
//Save each image at disk
Utilities.SaveAsImage(image.PageNumber + "_" + DocumentName, image.Stream);
}