WinAPI use in C#

            IntPtr phdl = OpenProcess(0x10, false, (uint)po.Id);
            IntPtr wrthdl = OpenProcess(0x20, false, (uint)po.Id);
            if (phdl == null)
                MessageBox.Show("Prozesshandle konnte nicht erstellt werden! Prozess aktiv?", "Fehler!");
            if (wrthdl == null)
                MessageBox.Show("WRITE-ProcHdl nicht erstellt!");
            uint size = 4;
            // uint vNumberOfBytesRead = 0;
            byte[] bytes = new byte[size];
            uint adress = 0x560264;
            uint size2 = sizeof(int);
            IntPtr rw;
            bool read;
            read = ReadProcessMemory(phdl, (IntPtr)adress, bytes, (UIntPtr)size2, out rw);
            if (!read)
                MessageBox.Show("Fehlschlag beim Lesen");
            else
            {
                MessageBox.Show(BitConverter.ToInt32(bytes, 0).ToString());
            }
            int money = BitConverter.ToInt32(bytes, 0);
            money = money + 10000;
            byte[] bytes2 = new byte[4];
            bytes2 = BitConverter.GetBytes(money);
            bool write;
            write = WriteProcessMemory(wrthdl, (IntPtr)adress, bytes2, (UIntPtr)size2, out rw);
            if (write)
                MessageBox.Show("Write kk");
            else if (!write)
                MessageBox.Show("Write not kk...");