FluentValidation in Startup.cs

startup.cs

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services
                .AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_2)
                .AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining<Startup>());
        }