public Result CopyItem(ISiteSetting siteSetting, Folder targetFolder, IItem copySource, string newFileName)
{
SPFolder spFolder = (SPFolder)targetFolder;
SPListItem spListItem = (SPListItem)copySource;
ISharePointService spService = new SharePointService();
return(spService.CopyFile(siteSetting, spFolder.WebUrl, spFolder.ListName, spFolder.FolderPath + "/" + newFileName));
}