How can you change lower case letter into upper case letters without typing everything over?

At work we use upper case letters for everything but sometimes I will accidentally write a paragraph in lower case and I don't realize it until i'm done. Is there a way to make them upper case without writing everything over?How can you change lower case letter into upper case letters without typing everything over?
If you're using MS Word, you can highlight the text you want to change and hit shift + F3 twice. The first time you hit it, it will only capitalize the first letter. The second time it capitalizes everything. The third time brings everything back down to lower case. You can toggle it all you want.How can you change lower case letter into upper case letters without typing everything over?
LOL, I have been looking for a program to do something similar. To change all caps, which are the sourge of the internet and AOLrs, to all lower case. I have yet to find one!
Select everything by pressing ctrl+a and then go to format and then change case.
Depends what you are using if notepad .. i dun think u can .. if MS words then sure you can.. you just have to change cases to UPPER CLASS