Transform C# code with unsafe to VB.net

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VB

memory

Hello, i have one problem,
i don't know how to transform this code to VB.net because it can't use unsafe structure.
Can anyone help me ?

Thank you

////convert BGRA8Packed to BGR8Packed
                        unsafe{
                        UInt32 sizeXold, sizeYold;
                        m_demosaicBitmap.GetSize(out sizeXold,out sizeYold);
                        newFormatBitmap.Resize((UInt32)gige.GVSP_PIXEL_TYPES.GVSP_PIX_BGR8_PACKED, sizeXold, sizeYold, 0, 0);
                        for (UInt32 y = 0; y < sizeYold; y++) {
                            Byte* rl = (Byte *) m_demosaicBitmap.GetRawData(y);
                            Byte* wl = (Byte *) newFormatBitmap.GetRawData(y);
                                for (UInt32 x = 0; x <  sizeXold; x++){
                                    wl[0] = (Byte)rl[0];
                                    wl[1] =(Byte)rl[1];
                                    wl[2] =(Byte)rl[2];                                                             
                                    rl += 4;
                                    wl += 3;
                                }
                            }
                        }

Thank you in advance