public string AcquirePhoneNumberToAdd() // acceptes only not existing numbers
{
string pn = null;
string filler = "";
while (true)
{
pn = UserDialog.AcquireStringFormated(filler + "phone number",
PhoneBook.PhoneNumberFilter, "digits only");
if (phoneBook.Exists(pn))
{
Console.WriteLine("This phone number already exists. Impossible to add");
filler = "another ";
}
else
{
break;
}
}
return(pn);
}
public string AcquirePhoneNumberToCheck()
{
return(UserDialog.AcquireStringFormated("phone number",
PhoneBook.PhoneNumberFilter, "digits only"));
}