Elegant way to make CustomValidator work with ValidationSummary messagebox

Question

I have run into this problem before but never quite solved it. I have a form with several validators and also a CustomValidator.

Answer 1

Try using a ValidationGroup property across all your validators and the ValidationSummary.

EDIT: Another possibility could be the Server Validation Code

args.IsValid = (!CampaignRegistration.IsMemberRegistered(args.Value));

if CampaignRegistration.IsMemberRegistered(args.Value) is returning false, "!" is making it true and therefore making it valid. I think you should get rid of the "!" as follows:

args.IsValid = CampaignRegistration.IsMemberRegistered(args.Value);

UPDATE: In order for the ValidationSummary to display your custom validator message in a messagebox, you need to have ClientValidationFunction Code. If you need to display just the summary without a popup, this is not needed.

*
   //JavaScript Code.
   function ClientValidate(source, args)
   {         
      args.IsValid = false; //you need to add validation logic here
   }

MORE: If you don't want to do ClientSide Validation, try this trick to show the alert. Make this change to your CustomValidator ServerValidate method:

protected void cvMemberNum_Validate(object source, ServerValidateEventArgs args)
{
    bool isValid = true;
    try
    {
        isValid  = (!CampaignRegistration.IsMemberRegistered(args.Value));
    }
    catch
    {
        isValid = false;
    }
    args.IsValid = isValid;

    if(!isValid)
    {
       if(!Page.IsClientScriptBlockRegistered("CustomValidation")) 
         Page.RegisterClientScriptBlock("CustomValidation", ""); 

    }

}