Custom Validation Help

[lizgjones]

Hi, I want to validate 2 textboxes on a web form to make sure neither of them are blank, i.e. both can be filled or either but neither can be empty. I have created a custom validator and entered the below code behind it:

Protected Sub cvVillageTown_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles cvVillageTown.ServerValidate
If tbVillage.Text = "" And tbTown.Text = "" Then
args.IsValid = False
Else
args.IsValid = True
End If
End Sub

However, I am working with components as I'm developing forms which a similar and the 'submit' button on which validation needs to be activated is on the master page. Is there a way of activating the error once the submit button is pressed? The other validators work e.g. required field as they can just be used without coding behind. Thanks