Hi Gudmundur,
Greetings from Syncfusion support.
We have prepared a sample based on your requirement for your convenience. Please download the sample from the link below,
Note : Ensure to change the connection string in OrderContext.cs file based on your local path before running the above attached application.
And also we suggest you to refer to the below documentation for more details regarding performing CRUD when use Custom way of binding data in Grid.
Please get back to us if you need further assistance.
Regards,
Renjith Singh Rajendran