ADO.NET Entity Framework: Create an Object Using the Static Create Method (C#)?

Identity parameters are auto-generated - you shouldn't need to specify the value yourself.

Here's another option: Cliente cliente = new Cliente { Email = datosCliente. Email, Password = datosCliente. Password }.

If you really want a undefined id which is not 0, such as -1, you could implement the default constructor for your entity and set it there.

No, you don't ever need to set the Id. Remove the parameter from the factory method and leave the Id value as the default (zero in this case I imagine).

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