public IEnumerable <string> GetErrosToCreate()
{
if (string.IsNullOrEmpty(FirstName) || FirstName.All(char.IsWhiteSpace))
{
yield return("First Name cannot be empty.");
}
if (string.IsNullOrEmpty(LastName) || LastName.All(char.IsWhiteSpace))
{
yield return("Last Name cannot be empty.");
}
if (string.IsNullOrEmpty(Document) || Document.All(char.IsWhiteSpace))
{
yield return("Document cannot be empty.");
}
}