public async Task <IActionResult> Edit(int id, [Bind("GraduateYearId,GraduateYearName")] GraduateYear graduateYear)
        {
            if (id != graduateYear.GraduateYearId)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    _context.Update(graduateYear);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!GraduateYearExists(graduateYear.GraduateYearId))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(graduateYear));
        }
        public async Task <IActionResult> Create([Bind("GraduateYearId,GraduateYearName")] GraduateYear graduateYear)
        {
            if (ModelState.IsValid)
            {
                _context.Add(graduateYear);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(graduateYear));
        }
        /// <summary>
        /// Инициализация таблицы "Год выпуска"
        /// </summary>
        /// <param name="serviceProvider"></param>
        /// <param name="configuration"></param>
        /// <returns></returns>
        public static async Task CreateGraduateYear(IServiceProvider serviceProvider, IConfiguration configuration)
        {
            using (var serviceScope = serviceProvider.GetRequiredService <Microsoft.Extensions.DependencyInjection.IServiceScopeFactory>().CreateScope())
            {
                AppIdentityDBContext context = serviceScope.ServiceProvider.GetService <AppIdentityDBContext>();

                #region Инициализация таблицы "Срок Обучения"
                if (!await context.GraduateYear.AnyAsync())
                {
                    GraduateYear GraduateYear1 = new GraduateYear
                    {
                        GraduateYearId   = 1,
                        GraduateYearName = "2016 год"
                    };

                    GraduateYear GraduateYear2 = new GraduateYear
                    {
                        GraduateYearId   = 2,
                        GraduateYearName = "2017 год"
                    };

                    GraduateYear GraduateYear3 = new GraduateYear
                    {
                        GraduateYearId   = 3,
                        GraduateYearName = "2018 год"
                    };

                    await context.GraduateYear.AddRangeAsync(
                        GraduateYear1,
                        GraduateYear2,
                        GraduateYear3
                        );

                    await context.SaveChangesAsync();
                }
                #endregion
            }
        }