How to trigger WFFM exception

Question

Using sc8.u3 with WFFM 8.2u3

I'm encrypting form data on submit. When there is an exception, I would like to show the error message but here, it always shows the success message.

public override void InsertFormData(FormData form)
        {
            Assert.ArgumentNotNull(form, "form");
            Assert.ArgumentNotNull(form.Fields, "form.Fields");

            try
            {
                form.Fields = EncryptFields(form.Fields);

                if (form.Fields != null)
                {
                    base.InsertFormData(form);
                }
            }
            catch(Exception ex) 
            {
                Log.Error("Exception: " + ex.Message, this);
                throw;              
            }
}

Answer 1

If you want to return your error message to user, you need to have ErrorMessage text field on your form,then get FormData form, find this ErrorMessage field and add your error message there. Also you need to wrap your logic:

public override void InsertFormData(FormData form)
        {
            Assert.ArgumentNotNull(form, "form");
            Assert.ArgumentNotNull(form.Fields, "form.Fields");

            try
            {
                form.Fields = EncryptFields(form.Fields);

                if (form.Fields != null)
                {
                    base.InsertFormData(form);
                }
            }
            catch(Exception ex) 
            {
                Log.Error("Exception: " + ex.Message, this);
                throw new Exception("Error Message");              
            }
}

If it not help, try to do step by step this suggestion