Also see the below Example:
Transfer te value on button click event:
<script language="JavaScript" type="text/javascript">
function NavigateToNext() {
window.location.href = "you page.aspx?Names=" + document.getElementById('TextBoxNames').value + "&CheckedItems=" + document.getElementById('TextBoxCheckedItems').value;
return false;
}
</script>
Aspx code
<asp:Button .......... OnClientClick="return NavigateToNext();" >