I don't know if this has been discussed in the past posts but I could not find anything similar so here goes my question: I have 14 fields on a custom control. Now on a particular condition during the workflow I need to ensure that the first 6 fields should be required (which can be done by using the required validator) and out of the other 8 fields the user should be forced to enter at least 2 fields. How can I achieve this? I am using server side validation for all fields with the property "disableClientSideValidation" set to true. I am not sure if a custom validator can be used in this context and if YES then how?