protected void customUsernameValidator_ServerValidate(object source, ServerValidateEventArgs args)
 {
     args.IsValid = false;
     if (!string.IsNullOrEmpty(txtUsername.Text))
     {
         if (_accountPresenter.DoesUsernameExist(txtUsername.Text))
         {
             args.IsValid = true;
             this.txtChangePasswordCode.Focus();
         }
     }
 }
        protected void customValidatorUsername_ServerValidate(object source, ServerValidateEventArgs args)
        {
            string username = txtUsername.Text;

            args.IsValid = true;

            if (!string.IsNullOrEmpty(username))
            {
                if (_accountPresenter.DoesUsernameExist(username))
                {
                    args.IsValid = false;
                }
            }
            else
            {
                args.IsValid = false;
            }
        }