ValidatingObjectBase Class

public abstract class ValidatingObjectBase : PersistableObjectBase, 
	IValidatingObject, IDataErrorInfo

Public MustInherit Class ValidatingObjectBase
	Inherits PersistableObjectBase
	Implements IValidatingObject, IDataErrorInfo

public ref class ValidatingObjectBase abstract : public PersistableObjectBase, 
	IValidatingObject, IDataErrorInfo

[<AbstractClassAttribute>]
type ValidatingObjectBase =  
    class
        inherit PersistableObjectBase
        interface IValidatingObject
        interface IDataErrorInfo
    end

public class MyModel : ValidatingObjectBase
{
    public int Id { get => Get<int>(); set => Set(value); }

    public string Name { get => Get<string>(); set => Set(value); }

    protected override ValidationResultsCollection DoValidation()
    {
        var result = new ValidationResultsCollection();

        // info
        if (Id == 0)
            result.AddInfo(nameof(Id), "This will be considered as a new object when saved");
            // or: result.Add(new ValidationResult(nameof(Id), "This will be considered as a new object when saved", ValidationSeverity.Information));

        // warning
        if (Id < 0)
            result.AddWarning(nameof(Id), $"{nameof(Id)} is recommended to be greater or equal to 0.");

        // error
        if (String.IsNullOrEmpty(Name))
            result.AddError(nameof(Name), $"{nameof(Name)} must not be null or empty.");

        return result;
    }
}