Create documents

        if (document == null)
        {
            //The document is created as master. The masterDocumentId is assigned to the master version.
            document = librariesManager.CreateDocument(masterDocumentId);

            //Set the parent document library.
            DocumentLibrary documentLibrary = librariesManager.GetDocumentLibraries().Where(d => d.Id == parentDocumentLibraryId).SingleOrDefault();
            document.Parent = documentLibrary;

            //Set the properties of the document.
            document.Title = documentTitle;
            document.DateCreated = DateTime.UtcNow;
            document.PublicationDate = DateTime.UtcNow;
            document.LastModified = DateTime.UtcNow;
            document.UrlName = Regex.Replace(documentTitle.ToLower(), @"[^\w\-\!\$\'\(\)\=\@\d_]+", "-");
            document.MediaFileUrlName = Regex.Replace(documentFileName.ToLower(), @"[^\w\-\!\$\'\(\)\=\@\d_]+", "-");

            //Recompiles and validates the url of the document.
            librariesManager.RecompileAndValidateUrls(document);
            
            //Upload the document file.
            librariesManager.Upload(document, documentStream, documentExtension);
           
            //Save the changes.
            librariesManager.SaveChanges();

            //Publish the DocumentLibraries item. The live version acquires new ID.
            var bag = new Dictionary<string, string>();
            bag.Add("ContentType", typeof(Document).FullName);
            WorkflowManager.MessageWorkflow(masterDocumentId, typeof(Document), null, "Publish", false, bag);
        }
    }
}

First, you get an instance of the `LibrariesManager` class. You check whether a document with the same `ID` already exists. Then, to create the document, you must call the `CreateDocument` method of the `LibrariesManager` class. You can create a document with either predefined or auto-generated `ID` depending which overload of the method you use. The method returns the master version of the document. Then, you get an instance of the specified parent document library. To associate the document with the document library, you set the document library to the `Parent` property of the `document` object. Then, you set the properties of the master version. We recommend to set at least the following properties: `Title`, `UrlName`, `LastModified`, `PublicationDate`, `DateCreated`, `MediaFileUrlName`. Then, to upload the document data, you call the `Upload` method of the `LibrariesManager` class and pass the stream of the selected file as parameter. To save the changes, you call the `SaveChanges` method of the manager. Finally, to publish the document, you call the `MessageWorkflow` method of the `WorkflowManager` class and pass the required parameters.
     
**Fluent API**
     ```C#
using System;
using System.Collections.Generic;
using System.IO;
using System.Text.RegularExpressions;
using Telerik.Sitefinity.Libraries.Model;
using Telerik.Sitefinity.Workflow;

namespace Telerik.Sitefinity.Documentation.CodeSnippets.DevGuide.SitefinityEssentials.Modules.MediaModules.DocumentsAndFiles.ManagingDocuments
{
    public partial class DocumentsSnippets
    {
        public static Guid CreateDocumentFluentAPI(Guid documentId, Guid parentDocumentLibraryId, string documentTitle, Stream documentStream, string documentFileName, string documentExtension)
        {
            //Check whether the parent DocumentLibrary exists.
            var count = 0;

            App.WorkWith().DocumentLibraries().Where(i => i.Id == parentDocumentLibraryId).Count(out count);

            if (count > 0)
            {
                //The document is created as master. The masterDocumentId is assigned to the master version.
                App.WorkWith().DocumentLibrary(parentDocumentLibraryId).CreateDocument()
                .Do(document =>
                {
                    //Set the properties.
                    documentId = document.Id;
                    document.Title = documentTitle;
                    document.DateCreated = DateTime.UtcNow;
                    document.PublicationDate = DateTime.UtcNow;
                    document.LastModified = DateTime.UtcNow;
                    document.Urls.Clear();
                    document.UrlName = Regex.Replace(documentTitle.ToLower(), @"[^\w\-\!\$\'\(\)\=\@\d_]+", "-");
                    document.MediaFileUrlName = Regex.Replace(documentFileName.ToLower(), @"[^\w\-\!\$\'\(\)\=\@\d_]+", "-");
                }).CheckOut()
                 //Upload the document stream.
                .UploadContent(documentStream, documentExtension)
                 //Save the changes.
                .CheckIn().Publish().SaveChanges();
            }

            return documentId;
        }
    }
}