如何保存新记录与散列密码在我的自定义表，而不是aspnet用户

我正在使用asp.net身份创建新用户，但得到错误:

不能在表列'Id'中插入NULL值"Mydb.dbo.AspNetUsers";列不允许为空。插入失败。'r'n语句已被终止

但是这里我没有任何像AspNetUsers这样的表，而是有我自己的表Users。

代码: 网络。config: 2个连接字符串

 <add name="myEntities" connectionString="metadata=res://*/DataModel.csdl|res://*/DataModel.ssdl|res://*/DataModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;data source=;initial catalog=mydb;user id=sa;password=sdfsdfsdf;MultipleActiveResultSets=True;App=EntityFramework&quot;" providerName="System.Data.EntityClient" />
 <add name="MyConnString" connectionString="data source=;initial catalog=Mydb;user id=sa;password=sdfsdfsdf;" providerName="System.Data.SqlClient" />

IdentityModel.cs:

public class ApplicationUser : IdentityUser
    {
        public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
        {
            // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
            this.SecurityStamp = Guid.NewGuid().ToString();
            var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
            // Add custom user claims here
            return userIdentity;
        }
        public string Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public virtual string Email { get; set; }
        public string Password { get; set; }
        public string Role { get; set; }
        public Nullable<bool> IsActive { get; set; }
        public Nullable<int> CreatedBy { get; set; }
        public Nullable<System.DateTime> CreatedDate { get; set; }
        public Nullable<System.DateTime> LastLogin { get; set; }
        public ApplicationUser()
        {
        }
        public ApplicationUser(string email, string firstName, string lastName, string designation, bool isActive)
        {
            Email = email;
            FirstName = firstName;
            LastName = lastName;
            Designation = designation;
            IsActive = isActive;
        }
    }
  public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext()
            : base("MyConnString", throwIfV1Schema: false)
        {
        }
        public static ApplicationDbContext Create()
        {
            return new ApplicationDbContext();
        }
    }

UserStore1.cs:

public class UserStore1 : IUserStore<ApplicationUser>, IUserPasswordStore<ApplicationUser>
    {
        private readonly HttpContext _httpContext;
        UserStore<IdentityUser> userStore = new UserStore<IdentityUser>(new ApplicationDbContext());
        public System.Threading.Tasks.Task CreateAsync(ApplicationUser user)
        {
            HttpContext.Current = _httpContext ?? HttpContext.Current;
            var context = userStore.Context as ApplicationDbContext;
           context.Users.Add(user);
           context.Configuration.ValidateOnSaveEnabled = false;
           context.SaveChanges();
            return Task.FromResult(true);
        }
     }

控制器:

     [Authorize]
    public class AccountController : Controller
    {
        public AccountController()
            : this(new UserManager<ApplicationUser>(new UserStore1()))
        {
        }
        public AccountController(UserManager<ApplicationUser> userManager)
        {
            UserManager = userManager;
        }
        public UserManager<ApplicationUser> UserManager { get; private set; }
[HttpPost]
        [AllowAnonymous]
        [ValidateAntiForgeryToken]
        public async Task<ActionResult> Login(string email, string password, bool rememberMe = false, string returnUrl = null)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser
                {
                    FirstName= "Abc",
                    LastName= "Pqr",
                    UserName="Abc@yahoo.com",
                    SecurityStamp = Guid.NewGuid().ToString()
                };
                var result= await UserManager.CreateAsync(user,"123456");
            }
            return View();
        }
    }

注意:我已经自动生成Id在我的数据库表字段，Id是Int.

更新:我首先使用数据库(edmx)，我使用的表是用于插入新记录的自定义表(例如:Users)。

首先，我已经实现了微软asp.net身份如下所示的问题，但1用户指出，我没有使用ApplicationUser类，它负责处理登录，cookie 等，所以我现在试图使用ApplicationUser类:

如何给asp.net身份的UpdateAsync方法的自定义实现?

我现在真的很后悔当初选择微软身份认证框架，因为我发现它很复杂，但现在随着我的发展，我不得不继续使用它。