Once your aimbot has set your viewangles x and y to the enemies head vector, you can put this below:
Code:
Drawing.DrawString(40, 20, normalFont, 1.0f, colRed, pClient.Name);
or if you want it glowing:
Code:
char szTargetName[128];
sprintf(szTargetName,"Target: %s", pClient.Name);
Drawing.DrawGlowText(szTargetName,20,normalFont,40,20,1.0f,1.0f,0,colWhite,6,colRed,0,0,0,0,0,0);
Please note that this is 100% not c+p so if you don't know what to do I advise you personally to read some books on c++. Also even download source codes that are all over the internet and study those.