asp.net - JavaScript runtime error: Member not found -

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i faced error first time , never before

i have asp.net login control , when press on , receive error says javascript runtime error: member not found.

in aspx page debugger highlighted portion 

<script type="text/javascript">  //<![cdata[  var theform = document.forms['form1'];  if (!theform) {      theform = document.form1;  }  function __dopostback(eventtarget, eventargument) {      if (!theform.onsubmit || (theform.onsubmit() != false)) {          theform.__eventtarget.value = eventtarget;          theform.__eventargument.value = eventargument;          theform.submit();  << section in yellow highlight        }  }  //]]>  </script>

so , why received error
thank you

i found error , because in default.aspx page have html button name submit , , button cause conflict between login control , submit button .


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