Sitefinity Helper to upload a file

UploadFile.cs

public static Document UploadFile(string fileTitle, Stream fileStream, string fileExtension, DocumentLibrary album, Guid folderId, List<Guid> categories, List<Guid> tags, string provider = "")
        {
            if (album != null)
            {
                LibrariesManager manager = LibrariesManager.GetManager(provider);
                manager.Provider.SuppressSecurityChecks = true;
                string urlname = Util.UrlNameFilter(fileTitle);

                Document document = null;
                //Check for document
                var matches = manager.GetDocuments().Where(x => x.UrlName == urlname);

                //Create the document.
                if (matches.Count() == 0)
                {
                    document = manager.CreateDocument();
                }
                else
                {
                    urlname += "-" + matches.Count() + 1;
                }

                document = manager.CreateDocument();

                //Get the downloadable goods library.

                if (album != null)
                {
                    document.Parent = album;
                    if (folderId != Guid.Empty)
                        document.FolderId = folderId;
                    document.Title = fileTitle;
                    document.DateCreated = DateTime.UtcNow;
                    document.PublicationDate = DateTime.UtcNow;
                    document.LastModified = DateTime.UtcNow;
                    document.UrlName = urlname;

                    TaxonomyManager taxonomyManager = TaxonomyManager.GetManager();

                    if (categories != null)
                    {
                        if (categories.Count() > 0)
                        {
                            foreach (var c in categories)
                            {
                                try
                                {
                                    var category = taxonomyManager.GetTaxa<HierarchicalTaxon>().Where(t => t.Taxonomy.Name == "Categories").FirstOrDefault(x => x.Id == c);
                                    if (category != null)
                                    {
                                        document.Organizer.AddTaxa("Category", c);
                                    }
                                }
                                catch (Exception ex)
                                {
                                    Util.SendRaygunError(ex, null);
                                }
                            }
                        }
                    }

                    if (tags != null)
                    {
                        if (tags.Count() > 0)
                        {
                            foreach (var t in tags)
                            {
                                try
                                {
                                    var tag = taxonomyManager.GetTaxa<FlatTaxon>().Where(x => x.Taxonomy.Name == "Tags").FirstOrDefault(x => x.Id == t);
                                    if (tag != null)
                                    {
                                        document.Organizer.AddTaxa("Tags", t);
                                    }
                                }
                                catch (Exception ex)
                                {
                                    Util.SendRaygunError(ex, null);
                                }

                            }
                        }
                    }

                    manager.Upload(document, fileStream, fileExtension);

                    manager.SaveChanges();

                    var bag = new Dictionary<string, string>();
                    bag.Add("ContentType", typeof(Telerik.Sitefinity.Libraries.Model.Document).FullName);
                    WorkflowManager.MessageWorkflow(document.Id, typeof(Document), null, "Publish", false, bag);

                    return document;
                }
            }

            return null;
        }