dynamic load assemblies from asp.net project folder

LoadAssemblies

        //folder is virtual path
        private void LoadAssemblies(string folder)
        {
            try
            {
                var directory = new DirectoryInfo(HostingEnvironment.MapPath(folder));
                var binFiles = directory.GetFiles("*.dll", SearchOption.AllDirectories).ToList();
                if (binFiles.Count == 0)
                {
                    logger.Warn("no dlls found!");
                    return;
                }

                var interfaceType = typeof(Interface);
                var attrType = typeof(NameAttribute);
                foreach (var dll in binFiles)
                {
                    var assembly = Assembly.LoadFile(dll.FullName);
                    var filters =
                        from type in assembly.GetTypes()
                        where !type.IsInterface && !type.IsAbstract
                        let attrs = type.GetCustomAttributes(attrType, false)
                        where attrs != null && attrs.Count() != 0
                        let attr = attrs[0] as NameAttribute
                        where !string.IsNullOrEmpty(attr.Name)
                        select new
                        {
                            ImplemetionType = type,
                            Name = attr.Name
                        };
                    foreach (var filter in filters)
                    {
                        container.RegisterType(interfaceType, filter.ImplemetionType, filter.Name);
                    }
                }
            }
            catch (Exception exception)
            {
                logger.Error(string.Format("can not load dlls at folder : {0}", folder), exception);
                return;
            }
        }