public void Add(User entity)
{
if (_db.Users.Any(u => u.Username.Equals(entity.Username, StringComparison.OrdinalIgnoreCase)))
{
throw new ArgumentNullException(nameof(entity), "Username was already taken!");
}
_db.Users.Add(entity);
_db.SaveChanges();
}
public void Add(DbConnection entity)
{
_db.DbConnections.Add(entity);
_db.Entry(entity.User).State = EntityState.Detached;
_db.SaveChanges();
}