I need to know how to clear a dc that i made with a function:

Public Function CreateDC(iH As Long, iW As Long) As Long
Dim temp As Long
CreateDC = CreateCompatibleDC(frmMain.hdc)
temp = CreateCompatibleBitmap(frmMain.hdc, iW, iH)
SelectObject CreateDC, temp
DeleteObject temp
End Function

i made a dc, then bitblt to it, now i want to clear it (like me.cls for forms) Can anyone here help me out?