gistfile1.txt

        public class Command : IRequest
        {
            private MyDbContext MyDbContext { get; }

            public Command(MyDbContext aMyDbContext)
            {
                MyDbContext = aMyDbContext;
            }

            public int ProjectId { get; set; }
            internal Project Project
            {
                get
                {
                    return MyDbContext.Projects.Find(ProjectId);
                }
            }
        }
        public class CommandValidator : AbstractValidator<Command>
        {
            public CommandValidator()
            {
                RuleFor(aCommand => aCommand.ProjectId).NotNull();
                RuleFor(aCommand => aCommand.Project).NotNull().WithMessage("Project with Id does not exsit etc....");
            }
        }