c# - how can I add a prefix string in the filename when upload a file using qq.FileUploader -


my code this, how can add prefix "123_" front of filename when user uploads 1.jpg, , change 123_1.jpg server?

                  <script type="text/javascript">                                                                var uploader = new qq.fileuploader({                                                         element: document.getelementbyid('file-uploader'),                                         allowedextensions: ["jpg", "pdf"],                                      template: '<div class="qq-uploader">' +                                                              '<div class="qq-upload-drop-area"><span>drag files here upload</span></div>' +                                       '<div class="qq-upload-button">upload files</div>' +                                             '<ul class="qq-upload-list"></ul>' +                                                         '</div>',                             action: '@url.action("upload", new { staffid = model.staffid })'                       });                    </script>

pretty simple,

public actionresult savefile(httppostedfilebase fileupload)     {                    string filename = "";       if (fileupload != null && fileupload.contentlength > 0)         {           filename = "123_"+ path.getfilename(fileupload.filename);           //rest code

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