CODE EXAMPLE FOR CSHARP

adding additional parameter to form submit

<form method="post" action="/Lot/LotList?auctionEventId=@auctionEventId" id="filterForm">

<input type="hidden" id="showAll" name="showAll" value=""/>

<input type="button" onclick="submitForm()" value="Show all" />
  
function submitForm(){
$('#showAll').val('true');
$('#filterForm').submit();
}

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--:)My code
  
<input type="submit" id="btnGenerate" value="Generate" class="btn btn-default" onclick="generate_alone()" style="text-align:center;width:100px;" />
<input type="submit" id="btnGenerateDownload" value="Generate & Download" class="btn btn-default" onclick="generate_n_download()" style="text-align:center;width:160px;" />
<input type="hidden" name="Generate" id="Generate" value="" />
<input type="hidden" name="Download" id="Download" value="" />

<script type="text/javascript">
	function generate_n_download() {
        $('#Generate').val('false');
        //alert($('#Generate').val());
        $('#Download').val('true');
        $('#frmAttendanceGeneration').submit();
    }
    function generate_alone() {
        $('#Generate').val('true');
        $('#Download').val('false');
        $('#frmAttendanceGeneration').submit();
    }
</script>