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We have prepared Entity CRUD sample with DataManger (standarad and recommended approach) instead of Schedule events for your reference which can be download from the below location.
<Code>
<ej:Schedule ID="Schedule1" ClientIDMode="Static" Height="525px" Width="100%" CurrentDate="10/10/2015" runat="server" DataSourceID="SqlDataSource1" >
<AppointmentSettings ApplyTimeOffset="false" Id="Id" Subject="Subject" AllDay="AllDay" StartTime="StartTime" EndTime="EndTime" Recurrence="Recurrence" />
<DataManager CrossDomain="true" URL="Default.aspx/GetData" CrudURL="Default.aspx/CrudResult" InsertURL="Default.aspx/InsertData" UpdateURL="Default.aspx/UpdateData" RemoveURL="Default.aspx/RemoveData" Adaptor="UrlAdaptor" />
</ej:Schedule>
</Code>
Note: Kindly set RedirectMode to Off in RouteConfig.cs file.
Regards,
Karthigeyan