private bool testForInvalidValues()
{
if (string.IsNullOrWhiteSpace(txtName.TextWithoutWatermark))
{
Feedback.ErrorInvalidName();
return(false);
}
if (string.IsNullOrWhiteSpace(txtLastName.TextWithoutWatermark))
{
Feedback.ErrorInvaliLastdName();
return(false);
}
if (string.IsNullOrWhiteSpace(txtEmail.TextWithoutWatermark) || !txtEmail.TextWithoutWatermark.Contains("@") || !txtEmail.TextWithoutWatermark.Contains("."))
{
Feedback.ErrorInvaliEmail();
return(false);
}
if (string.IsNullOrWhiteSpace(txtPhoneNumber.TextWithoutWatermark) || !txtPhoneNumber.TextWithoutWatermark.Any(char.IsDigit))
{
Feedback.ErrorInvalidTel();
return(false);
}
if (!DateTime.TryParse(txtBirthDate.TextWithoutWatermark, out DateTime birthDate))
{
Feedback.ErrorInvalidDate();
return(false);
}
if ((DateTime.Today.Date - birthDate.Date) < new TimeSpan(365 * 18, 6 * 18, 0, 0)) //min. Alter
{
Feedback.ErrorInvalidAge();
return(false);
}
if (string.IsNullOrWhiteSpace(txtStreet.TextWithoutWatermark))
{
Feedback.ErrorInvalidStreet();
return(false);
}
if (string.IsNullOrWhiteSpace(txtHouseNumber.TextWithoutWatermark))
{
Feedback.ErrorInvalidHouseNumber();
return(false);
}
if (string.IsNullOrWhiteSpace(txtPlz.TextWithoutWatermark) || !txtPlz.TextWithoutWatermark.All(char.IsDigit))
{
Feedback.ErrorInvalidPLZ();
return(false);
}
if (string.IsNullOrWhiteSpace(txtCity.TextWithoutWatermark))
{
Feedback.ErrorInvalidCity();
return(false);
}
if (string.IsNullOrWhiteSpace(txtCountry.TextWithoutWatermark))
{
Feedback.ErrorInvalidCountry();
return(false);
}
if (!DBController.TryGetAllCustomers(out List <Customer> customers))
{
Feedback.ErrorDatabaseConnection();
return(false);
}
if (txtEmail.TextWithoutWatermark != customerOld.EmailAddress)
{
foreach (Customer c in customers)
{
if (txtEmail.TextWithoutWatermark == c.EmailAddress)
{
Feedback.ErrorAlreadyExistingEmail();
return(false);
}
}
}
return(true);
}