database.SaveChanges() throws EntityValidationException - asp.net-mvc

Question

New to MVC. When I try to add a user to the database using Entity Framework Database First I get this exception:
An exception of type 'System.Data.Entity.Validation.DbEntityValidationException' occurred in EntityFramework.dll but was not handled in user code
Additional information: Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.
This is the code:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Index(RegisterViewModel account)
{
if (ModelState.IsValid)
{
using (db)
{
bool duplicate = db.Users.Any(a => a.UserName == account.UserName);
if (duplicate)
{
ModelState.AddModelError("", "Username already exists in database!");
}
else
{
db.Users.Add(new StoreFront.Models.User { UserName = account.UserName, Password = account.Password, EmailAddress = account.EmailAddress, IsAdmin = false, DateCreated = DateTime.Now });
db.SaveChanges();
ModelState.Clear();
ModelState.AddModelError("RegisterSuccess", "Successfully registered!");
}
}
}
return View();
}
I have validation in my RegisterViewModel for all fields, and when I debug, IsValid = true, otherwise it wouldn't run anyway. Any help would be greatly appreciated...I have been struggling with this for a while.
P.S. Yes the password is currently being stored as a string, this is just a test project that won't be used in the real world.
EDIT: Added Models:
User Model from database:
public partial class User
{
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")]
public User()
{
this.Addresses = new HashSet<Address>();
this.Orders = new HashSet<Order>();
this.ShoppingCarts = new HashSet<ShoppingCart>();
}
public int UserID { get; set; }
public string UserName { get; set; }
public string Password { get; set; }
public string EmailAddress { get; set; }
public Nullable<bool> IsAdmin { get; set; }
public Nullable<System.DateTime> DateCreated { get; set; }
public string CreatedBy { get; set; }
public Nullable<System.DateTime> DateModified { get; set; }
public string ModifiedBy { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<Address> Addresses { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<Order> Orders { get; set; }
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public virtual ICollection<ShoppingCart> ShoppingCarts { get; set; }
}
Partial Model to add ConfirmPassword:
namespace StoreFront.Models
{
[MetadataType(typeof(RegisterViewModel))]
public partial class User
{
[DisplayName("Confirm Password")]
[DataType(DataType.Password)]
[Compare("Password", ErrorMessage = "Passwords must match")]
public string ConfirmPassword { get; set; }
}
}
RegisterViewModel:
public class RegisterViewModel
{
public int UserID { get; set; }
[DisplayName("Username")]
[Required(ErrorMessage = "Username is required")]
public string UserName { get; set; }
[DisplayName("Password")]
[DataType(DataType.Password)]
[Required(ErrorMessage = "Password is required")]
public string Password { get; set; }
[DisplayName("Confirm Password")]
[DataType(DataType.Password)]
[Compare("Password", ErrorMessage = "Passwords must match")]
public string ConfirmPassword { get; set; }
[DisplayName("Email")]
[Required(ErrorMessage = "Email is required")]
[RegularExpression(#"^([a-zA-Z0-9_\-\.]+)#([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$",
ErrorMessage = "Please enter a valid email")]
public string EmailAddress { get; set; }
public Nullable<bool> IsAdmin { get; set; }
public Nullable<System.DateTime> DateCreated { get; set; }
}

Answer 1

Fix: When I looked up a tutorial about MVC it asked em to create a partial class and a meta class. That was for code first I believe, which basically made it a new field that my database didn't have a spot for, and I am using database first. So I removed the deleted the partial class for User and it stopped making ConfirmPassword an actual field in the database.
Don't know the real works of it, or if what I said makes sense, but I hope this helps someone eventually.

Answer 2

Remove
[RegularExpression(#"^([a-zA-Z0-9_\-\.]+)#([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5})$",
ErrorMessage = "Please enter a valid email")]
from RegisterViewModel