Allow comma separated entry i.e. 1234,Name,01/01/07 or 1234,,01/01/07.
Then just pull the string apart and search on what is required.

>I have a search button which asks for 3 inputs from users, (riskno, name and effectivity date)
>
>How can I do this in such a way that all 3, or 2 or only 1 can be entered. Like the user can search by entering name and effectivity date, or enter the riskno alone, or enter the riskno, name and effectivity date.
>
>???
>
>TIA.