How to detect change data in Client side to send to Server side

We have a winform application, run as client-server architect. Communication between client and server are using Web API.

Example: when User open an Order info include 10 line items, they change data just one line item and click Update

I don't want send data of Order with all 10 line items again back to server, So, what pattern or technique should apply at client side to detect the changes of data?