Programmaticly create new Service Appointment (C#)

In Salesforce, how do I create a Service Appointment programmaticly via Force API (SOAP or REST API)?

Are there known method calls that do this?

C# code-behind

I have linked to the WSDL can I can create ServiceAppointment objects, but they have no internal methods I can call.

ServiceAppointment sa = new ServiceAppointment();

//sa.CreateServiceAppointment(  ... params ... )  //   nothing like this exists.

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