How could I show months and year chosen from dropdownlist in asp.net calendar without page refresh

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C#

ASP.NET

Ajax

This is my code to show the year and month on calendar based on user entered year and month from dropdownlist.

<div>
            <asp:UpdatePanel ID="updatePanelYear" runat="server"  UpdateMode="Conditional">
                <ContentTemplate>
                    <label id="lblYears" runat="server" class="editor-label">Select Year  </label>
                    <asp:DropDownList ID="ddlYear" runat="server" CssClass="ddlDataEntry" AppendDataBoundItems="True" AutoPostBack="True" OnSelectedIndexChanged="ddlYear_SelectedIndexChanged" />
                </ContentTemplate>
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="calendar" EventName="DayRender" />
                </Triggers>
            </asp:UpdatePanel>

        </div>
         <div>
             <asp:UpdatePanel ID="updatePanelMonths" runat="server"  UpdateMode="Conditional">
                <ContentTemplate>
                    <label id="lblMonths" runat="server" class="editor-label">Select Month  </label>
                    <asp:DropDownList ID="ddlMonth" runat="server" CssClass="ddlDataEntry" AppendDataBoundItems="True" AutoPostBack="True" OnSelectedIndexChanged="ddlMonth_SelectedIndexChanged" />
                </ContentTemplate>
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="calendar" EventName="DayRender" />
                </Triggers>
            </asp:UpdatePanel>
         </div>

<asp:UpdatePanel ID="updatePanelCalender" runat="server" UpdateMode="Conditional">
                               <ContentTemplate>
                                   <asp:Calendar ID="calendar" runat="server" CssClass="myCalendarForUser" OnDayRender="calendar_DayRender">
                                       <OtherMonthDayStyle ForeColor="#b0b0b0" />
                                       <DayStyle CssClass="myCalendarForUserDay" ForeColor="#2d3338" />
                                       <DayHeaderStyle CssClass="myCalendarForUserDayHeader" ForeColor="#2d3338" />
                                       <SelectedDayStyle Font-Bold="True" Font-Size="12px" CssClass="myCalendarForUserSelector" />
                                       <TodayDayStyle CssClass="myCalendarForUserToday" />
                                       <SelectorStyle CssClass="myCalendarForUserSelector" />
                                       <NextPrevStyle CssClass="myCalendarForUserNextPrev" />
                                       <TitleStyle CssClass="myCalendarForUserTitle" />
                                   </asp:Calendar>
                               </ContentTemplate>
                   </asp:UpdatePanel>

Now, everything works fine when the update panel is not present in the code. As I placed update panel in the code and clicked on month value in dropdownlist, I got an error that says "The 'DayRender' event on associated control 'calendar' for the trigger in UpdatePanel 'updatePanelYear' does not match the standard event handler signature." i came to knew that dayrender event can not be fired on client side so this error has occured. How can i correct this or get ride of page refresh as user selects values from dropdownlist?
Thanks in advance.