Read MFT and SetFilePointer

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file-system

this is code that found MFTOffset and other information.

uint nread = 0;
           IntPtr handle;
           byte[] buff = new byte[1024];
           string driveRoot = string.Concat("\\\\.\\", driveLetter);
           IntPtr hRoot = CreateFile(driveRoot,
               GENERIC_READ | GENERIC_WRITE,
               FILE_SHARE_READ | FILE_SHARE_WRITE,
               IntPtr.Zero,
               OPEN_EXISTING,
               FILE_ATTRIBUTE_NORMAL,
               IntPtr.Zero);
           if (hRoot != IntPtr.Zero)
                ReadFile(hRoot, buff, 1024,out nread, IntPtr.Zero);
           string SystemFile = Convert.ToString(LittleEndian(4, new byte[] { buff[3], buff[4], buff[5], buff[6] }, typeof(string)));
           int BytePerSector = 0;
           int SectorPerCluster = 0;
           double MFTStart = 0;
           if (SystemFile == "NTFS")
           {
               listBox1.Items.Add(SystemFile);

               BytePerSector = (int)LittleEndian(2, new byte[] { buff[11], buff[12] }, BytePerSector.GetType());
               listBox1.Items.Add("Byte per Sector : " + BytePerSector);

               SectorPerCluster = (int)LittleEndian(1, new byte[] { buff[13] }, typeof(int));
               listBox1.Items.Add("Sector per Cluster : " + SectorPerCluster.ToString());

               MFTStart = (long)LittleEndian(8, new byte[]{
                   buff[48],buff[49],buff[50],buff[51],buff[52],buff[53],buff[54],buff[55]}, typeof(long));
               listBox1.Items.Add("MFT LCN : " + MFTStart);

           }
           else
               listBox1.Items.Add("No NTFS Valoume");

I wanna read MFT.I found its offset on partition.i got partition handle with CreateFile API then i got MFT offset from MBR with ReadFile API.i compared result with WinHex and result was correct.now i wanna move to mft address on partition.i found SetFilePointer API to do it.could u send me correct code to move MFT offset??
i used SetFilePointer but i got error while use ReadFile(newAddress)

public static void ReadMFT(string DriveLetter, ulong MFTStart, int bytepersector, int sectorpercluster)
        {
            IntPtr handle = IntPtr.Zero;
            IntPtr newaddress = IntPtr.Zero;
            long MFTAddress = bytepersector * sectorpercluster * (long)MFTStart;
            string driveRoot = string.Concat("\\\\.\\", DriveLetter);
            IntPtr hRoot = CreateFile(driveRoot,
                GENERIC_READ | GENERIC_WRITE,
                FILE_SHARE_READ | FILE_SHARE_WRITE,
                IntPtr.Zero,
                OPEN_EXISTING,
                FILE_ATTRIBUTE_NORMAL,
                IntPtr.Zero);

            newaddress = SetFilePointer(hRoot, (ulong)MFTAddress, IntPtr.Zero, 0);
            Console.WriteLine("hroot : " + hRoot.ToString());
            Console.WriteLine("MFTAddress : " + MFTAddress.ToString());
            Console.WriteLine("NewAddress : " + newaddress.ToString());
            if (hRoot.ToInt64() != INVALID_HANDLE_VALUE)
            {
                uint nread;
                byte[] buff = new byte[1024];
                if (ReadFile(newaddress, buff, (uint)buff.Length, out nread, IntPtr.Zero))
                    Console.WriteLine("Read successful");
                else
                    Console.WriteLine("Read unsuccessful");

            }
            while (true)
            {
                //read other MFT Record
                break;
            }
        }