Open edit window after creating

It's possible to open the edit dialog on the client side as soon as the TimeRangeSelected callback is finished. You can pass custom data back to the client side using DayPilotCalendar.Update() and read it using AfterRenderJavaScript:

<asp:Panel runat="server" ID="Schedule">
    <div style="float:left; width: 150px;">
        <DayPilot:DayPilotNavigator 
            runat="server" 
            ID="DayPilotNavigator1" 
            ClientIDMode="Static"
            BoundDayPilotID="DayPilotCalendar1"
            ShowMonths="3"    
            SelectMode="Week"
        
            OnBeforeCellRender="DayPilotNavigator1_OnBeforeCellRender"
            />  
    </div>
    
    <div style="margin-left: 150px;">
        <DayPilot:DayPilotCalendar 
            runat="server" 
            ID="DayPilotCalendar1"
            ClientObjectName="dp"
            ClientIDMode="Static"
            ViewType="Week"
        
            OnCommand="DayPilotCalendar1_OnCommand"
            TimeRangeSelectedHandling="CallBack"
            OnTimeRangeSelected="DayPilotCalendar1_OnTimeRangeSelected"
            OnBeforeEventRender="DayPilotCalendar1_OnBeforeEventRender"
            EventClickHandling="JavaScript"
            EventClickJavaScript="edit(e.id());"
            EventMoveHandling="CallBack"
            OnEventMove="DayPilotCalendar1_OnEventMove"
            EventResizeHandling="CallBack"
            OnEventResize="DayPilotCalendar1_OnEventResize"
            
            AfterRenderJavaScript="if (data && data.open) { edit(data.open); }"
            />
    </div>
</asp:Panel>
    
    
<script>
function edit(id) {
    new DayPilot.Modal({
        onClosed: function(args) {
            if (args.result == "OK") {
                dp.commandCallBack('refresh');
            }
        }
    }).showUrl("Edit.aspx?id=" + id);
}
</script>
</asp:Content>

Note that AfterRenderJavaScript is added and the edit() JS function is modified to accept event id instead of DayPilot.Event object.

    protected void DayPilotCalendar1_OnTimeRangeSelected(object sender, TimeRangeSelectedEventArgs e)
    {
        int doctor = Convert.ToInt32(Request.QueryString["id"]);

        int id = Db.CreateAppointment(doctor, e.Start, e.End);

        LoadCalendarData();

        Hashtable msg = new Hashtable();
        msg["open"] = id;
        DayPilotCalendar1.Update(msg);
    }

Note that Update() sends a custom object with back to the client (it holds the event id). This object is available as "data" variable in AfterRenderJavaScript.

    public static int CreateAppointment(int doctor, DateTime start, DateTime end)
    {
        using (SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["daypilot"].ConnectionString))
        {
            con.Open();
            SqlCommand cmd = new SqlCommand("INSERT INTO [Appointment] ([AppointmentStart], [AppointmentEnd], [DoctorId]) VALUES(@start, @end, @doctor)", con);
            cmd.Parameters.AddWithValue("start", start);
            cmd.Parameters.AddWithValue("end", end);
            cmd.Parameters.AddWithValue("doctor", doctor);
            cmd.ExecuteNonQuery();

            cmd = new SqlCommand("select @@identity;", con);
            int id = Convert.ToInt32(cmd.ExecuteScalar());
            return id;
        }
    }

It returns an id of the new record.