public string this[string columnName]
{
get
{
string result = string.Empty;
switch (columnName)
{
case "FirstName": FirstName.GetErrorIfEmpty(ref result); break;
case "LastName": LastName.GetErrorIfEmpty(ref result); break;
case "StreetName": StreetName.GetErrorIfEmpty(ref result); break;
case "PostalCode": PostalCode.GetErrorIfNotPostalCode(ref result); break;
case "PhoneNumber": PhoneNumber.GetErrorIfNotPhoneNumber(ref result); break;
}
return(result);
}
}