Implementation of model in MVVM

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MVVM

Hello,

I'm struggling with a question about the implementation of the Model / Viewmodel in the MVVM pattern.

I have the folowing classes in my project

public class Client
{
    public int ID;
    public string Name;
}
public class Invoice
{
    public int ID;
    public Client MyClient;
}

The same structure is used in my SQLite database:

CREATE TABLE `Clients` (
	`ID`	integer NOT NULL PRIMARY KEY AUTOINCREMENT,
	`Name`	varchar
);
CREATE TABLE `Invoices` (
	`ID`		integer NOT NULL PRIMARY KEY AUTOINCREMENT,
	`Client_ID`	integer
);

I'm using sqlite-net to write to my database. But how should I map the Client object to the Client_ID column?