How do I clear a textbox by just clicking on it? Also, a database(?) related question

Hello!

It's my first time to post on this forum, and I'm looking forward to post more as time passes. :)

But for now, I would like to ask a couple of questions...

First, how do I clear the contents of a Textbox by just clicking on it?

Second, a more complicated one... I would like to create a VB program where I would just input a number (say, an student ID number) and the details of the student would be displayed. I know it has something to with databases, but I'm not really sure. I have only basic knowledge of VB, and I am using an older version.

Thank you in advance.

Cheers.