Using id from event in modal dialog

You should be able to pass the event id to the modal dialog like this:

<DayPilot:DayPilotScheduler
ID="DayPilotScheduler1"
runat="server"
EventClickHandling="JavaScript"
EventClickJavaScript="eventClick(e);"
...
/>

<script>
function eventClick(e) {
new DayPilot.Modal().showUrl("Edit.aspx?id=" + e.id());
}
</script>

The EventClickJavaScript event handler receives the event object (DayPilot.Event) as "e". You can get the event id by calling e.id().

Please let me know if it doesn't work as expected.