<dxe:ASPxDateEdit ID="txtDate" ClientInstanceName="txtDate" Width="100" runat="server" EditFormat="Custom" EditFormatString="yyyy-MM-dd" AutoPostBack="False"> <ClientSideEvents ValueChanged="function(s, e) {chartHumi.PerformCallback();chartTemp.PerformCallback();}"></ClientSideEvents> </dxe:ASPxDateEdit>