Postback - .net

1.  When a user enter's a value in a text field on a web form, I want to
display everything in capital.  How canI do so?

2.  I have a form with two command buttons (Submit).  The first one is to
search and retrieve data in to one of the drop downs on a form.  The second
one is for Adding a new record to database.    But the problem is when I
click on the first button, it validates the text fields under the second
button group.  What can I do it limit validation to only certain fields on a
postback/submit.?

Thanks in Advance
BVR