get_posted_files

/// <summary>
/// Get all HTTP POSTed Files that were uploaded as part of a
/// multipart form POST. This abstraction keeps the controller
/// from dealing with the Request object directly.
/// </summary>
public IEnumerable<HttpPostedFileBase> HttpPostedFiles
{
    get
    {
        // _httpContext has been pre-assigned to be the current HttpContextBase 
        // object running on the server.
        return _httpContext.Request.Files.Cast<string>()
               .Select(httpFile => _httpContext.Request.Files[httpFile])
               .Where(postedFile => postedFile.ContentLength > 0);
    }
}