I have several server controls that implement the IValidator interface. As such, they have their own Validate() methods that look like this.

public void Validate()
{
  this.IsValid = true;
  if (someConditionFails())
  {
    ErrorMessage = "Condition failed!";
    this.IsValid = false;
  }
}

I understand that these Validate() methods are executed on postback before the load completed event that is executed before the save button's event handler. What I would like to do is pass in a reference to an instance of a custom class that collects all the error messages that I can access from Save button event handler.

In other words, I would like to do something like this:

public void Validate(ref SummaryOfErrorMessages sum)

I guess I can't do this as the signature is different from what the IValidator interface has. The other option I can think of is on Load Completed event, I would iterate through all the validators on page, get the ones with IsValid = false and create my SummaryOfErrorMessages there. Does this sound right? Is there a better way of doing it?