Stop Automatic model state validation in mvc or web api

In Startup.cs file

Source: https://www.talkingdotnet.com/disable-automatic-model-state-validation-in-asp-net-core-2-1/

Validate Model out side of the controller

var vc = new ValidationContext(myObject, null, null);
return Validator.TryValidateObject(myObject, vc, null, true);

Source: https://stackoverflow.com/questions/3782678/how-can-i-use-the-data-validation-attributes-in-c-sharp-in-a-non-asp-net-context