c# - How can I cancel ajaxToolkit:AjaxFileUpload inside OnClientUploadStart? -

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i'm trying validation of other fields on page after user clicks upload button of ajaxfileupload control. onclientuploadstart defined fire before upload starts. , works. want cancel upload if validation fails. tried doing "return false;" didn't work. how can cancel upload?

if validation fails want cancel 

 function uploadstart(sender, args) {              var filedescription = document.getelementbyid("filedescription").value;              alert( filedescription);          return false;          }   <ajaxtoolkit:ajaxfileupload id="ajaxfileupload1"     throbberid="mythrobber" onuploadcomplete="ajaxfileupload1_uploadcomplete"     contextkeys="" onclientuploaderror="uploaderror" onclientuploadcomplete="uploadcomplete" onclientuploadstart="uploadstart"      allowedfiletypes="jpg,jpeg,doc,xls"     maximumnumberoffiles="1"     runat="server"/>

to start uploading manually can use script:

function startupload(){     $get("<%= ajaxfileupload1.clientid %>_uploadorcancelbutton").click(); }

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