public RegisterPageViewModel()
{
Register = new DelegateCommand(Registration);
Cancel = new DelegateCommand(NavigatoBack);
BirthDay = System.DateTime.Now;
GenderType.Add("Male");
GenderType.Add("Female");
ErrorEmail = true;
ErrorPsw = true;
ErrorPswConfirm = true;
ErrorUserName = true;
HasError = true;
}