C# string pointer nasıl okutulur?

public static string ReadNullTerminatedWString(IntPtr handle, IntPtr addr, int maxlength)
{
    var bytearray = new byte[maxlength*2];

    IntPtr bytesread = IntPtr.Zero;

    ReadProcessMemory(handle, addr, bytearray, maxlength*2, out bytesread);

    int nullterm = 0;
    while (nullterm < bytesread.ToInt64() && bytearray[nullterm] != 0)
    {
        nullterm = nullterm + 2;
    }

    string s = Encoding.Unicode.GetString(bytearray, 0, nullterm);

    return s;
}