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Testing a command using data annotations and DDD "ChangeProperty" methods

Taking a simple entity below ...

public class MyEntity
{
    [MaxLength(100)]
    [Required]
    public string Name { get; private set; }
}

... you can read data annotations that adorn the Name property and validate the value specified in the ChangeName method, so ValidationResults can be combined with other validation results. Am I assuming using MethodInfo or PropertyInfo objects in some way?

I have it, but it feels very clumsey.

    public ValidationResult ChangeName(string value)
    {
        var property = GetType().GetProperty("Name");
        var attribute = property.GetCustomAttributes(typeof(MaxLengthAttribute), true)[0] as MaxLengthAttribute;
        if (attribute == null) return null; //yield break;

        if (value.Length > attribute.Length)
        {
            return new ValidationResult(NameValidation.NameTooLong);
        }

        return null;
    }

I want to be able to call ChangeName (value) from a method in my validator, for example:

    private IEnumerable<ValidationResult> ValidateMyEntity(MyEntityAddCommand command)
    {
        MyEntity myEntity = new MyEntity();
        yield return myEntity.ChangeName(command.Name);
    }

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