protected override bool Validate()
{
bool valid = true;
bool ok2Validate = true;
IValidatable iValidatatble = ControlToValidate.Parent as IValidatable;
if (iValidatatble != null)
{
ok2Validate = iValidatatble.Ok2Validate();
}
if (IsEnabled &&
ControlToValidate != null &&
ControlToValidate.Enabled &&
ErrorProvider != null &&
ok2Validate)
{
// Is valid if different than initial value,
// which is not necessarily an empty string
string controlValue = ControlToValidate.Text.Trim();
string initialValue;
if (_initialValue == null)
{
initialValue = "";
}
else
{
initialValue = _initialValue.Trim();
}
_isValid = (controlValue != initialValue);
string errorMessage = "";
if (!_isValid)
{
errorMessage = _errorMessage;
if (_icon != null)
{
ErrorProvider.Icon = _icon;
}
valid = false;
if (ControlToValidate is ATMLControl)
{
((ATMLControl)ControlToValidate).HasErrors = true;
}
}
ErrorProvider.SetError(_controlToValidate, errorMessage);
}
return(valid);
}