public bool Validate()
{
var item1IsValid = Item1.Validate();
var item2IsValid = Item2.Validate();
if (item1IsValid && item2IsValid)
{
Errors.Clear();
IEnumerable <string> errors = Validations.Where(v => !v.Check(this))
.Select(v => v.ValidationMessage);
Errors = errors.ToList();
Item2.Errors = Errors;
Item2.IsValid = !Errors.Any();
}
IsValid = !Item1.Errors.Any() && !Item2.Errors.Any();
return(this.IsValid);
}