How to define an optional field

murugappan

Lexman
Hi,

I want define a field which optional but has validation when data is entered. My Example is:

(1) I have a field Contact Name
(2) If the Contact Name field is not empty, then i want request for Email Address which is the optional field. I want the Email Address field to have email validation only when entered.

How can i do this?
 
We are in need of some funding.
More details.

Thank you.

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