public async void LoadData() { // i implement that method because inmemorydatabase cant configure seed on onmodelcreating if (!Products.Any()) { List <Products> P = new List <Products>() { new Products { Id = 1, Name = "Barbie Developer", AgeRestriction = 12, Price = 25.99m, Company = "Mattel", Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris porta arcu arcu, vel varius enim ia" }, new Products { Id = 2, Name = "xyc", AgeRestriction = 4, Price = 75.50m, Company = "Marvel", Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris porta arcu arcu, vel varius enim ia" }, new Products { Id = 3, Name = "abc", AgeRestriction = 18, Price = 99.99m, Company = "Nintendo", Description = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris porta arcu arcu, vel varius enim ia" } }; await Products.AddRangeAsync(P); await SaveChangesAsync(); Guid ADMIN_ID = Guid.NewGuid(); Guid User = Guid.NewGuid(); var hasher = new PasswordHasher <AppUser>(); List <AppUser> Users = new List <AppUser>() { new AppUser { Id = ADMIN_ID, UserName = "******", NormalizedUserName = "******", Email = "*****@*****.**", NormalizedEmail = "*****@*****.**", EmailConfirmed = true, PasswordHash = hasher.HashPassword(null, "unosquareAdmin2020."), }, new AppUser { Id = User, UserName = "******", NormalizedUserName = "******", Email = "*****@*****.**", NormalizedEmail = "*****@*****.**", EmailConfirmed = true, PasswordHash = hasher.HashPassword(null, "2020Client."), } }; List <Role> Roles = new List <Role>() { new Role { Id = ADMIN_ID, Name = "Admin", NormalizedName = "ADMIN" } }; List <UserRoles> userRoles = new List <UserRoles>() { new UserRoles { RoleId = ADMIN_ID, UserId = ADMIN_ID } }; foreach (var i in Users) { await AddAsync(i); await SaveChangesAsync(); } foreach (var i in Roles) { await AddAsync(i); await SaveChangesAsync(); } foreach (var i in userRoles) { await AddAsync(i); await SaveChangesAsync(); } } }