SharePoint - Programové vytvoření dokumentové knihovny

using (SPWeb site = SPContext.Current.Web)
{
    site.AllowUnsafeUpdates = true;
    Guid libraryId = site.Lists["Documents"].ID;
    SPDocumentLibrary library = (SPDocumentLibrary)site.Lists[libraryId];

    string documentName = "textfile.txt";
    string libraryRelativePath = library.RootFolder.ServerRelativeUrl;
    string libraryPath = SPContext.Current.Site.MakeFullUrl(libraryRelativePath);
    string documentPath = libraryPath + "/" + documentName;
    using (Stream documentStream = new MemoryStream())
    {
        StreamWriter writer = new StreamWriter(documentStream);
        writer.Write("attempt to create a file");
        writer.Flush();
        site.Files.Add(documentPath, documentStream, true);
    }
}