Ondraw function .net 3.0

Question

Hai all....

I have installed Visual Studio 2005 which installs default .net framework 2.0.. I want to implement Ondraw function for my appln but its been introduced only in .net 3.0 n higher versions...

Wat should i do now.... Downlaod .net 3.0 and install separately...if done will it affect vs 2005 already installed.....

Hope i made myself clear....

Help me....