C++一小段程序转成C#!(急用)

void CMapView::OnDraw(CDC* pDC)
{
if( m_pMapSpac->GetCount()>0 )
{
CBitmap bmp; 
CDC dcMemory; dcMemory.CreateCompatibleDC(pDC);
bmp.CreateCompatibleBitmap(pDC,m_DrawParam.clientW,m_DrawParam.clientH );
dcMemory.SelectObject(&bmp); 
dcMemory.FillSolidRect(
0,
0,
m_DrawParam.clientW,
m_DrawParam.clientH,
RGB(201,220,233)
) //BitBlt() 显示位图函数
pDC->BitBlt(0,0,m_DrawParam.clientW, m_DrawParam.clientH,&dcMemory,0,0,SRCCOPY);  dcMemory.DeleteDC(); 
bmp.DeleteObject();
}
}高手帮转!!! 最好给点说明(CDC* pDC),学习一下!!!