参考：

http://www.aspdotnet-suresh.com/2014/01/jquery-multiple-file-upload-with-progress- bar-aspnet.html [ ^ ]

http://www.aspsnippets.com/Articles/Asynchronous-File-Upload-with-jQuery-Uploadify-in-ASPNet.aspx [ ^ ]

Refer:
http://www.aspdotnet-suresh.com/2014/01/jquery-multiple-file-upload-with-progress-bar-aspnet.html[^]
http://www.aspsnippets.com/Articles/Asynchronous-File-Upload-with-jQuery-Uploadify-in-ASPNet.aspx[^]

因为你正在使用jQuery：使用jQuery进行多文件上传 [ ^ ]

Since you are using jQuery: Multiple File Upload Using jQuery[^]

只需使用

ajax FileUpload 带示范