IL_0000:  ldc.i4 1048576
        IL_0005:  newarr [mscorlib]System.Byte
        IL_000a:  stloc.0 
        IL_000b:  ldloc.0 
        IL_000c:  ldc.i4.0 
        IL_000d:  ldelema [mscorlib]System.Byte
        IL_0012:  stloc.1 
        IL_0013:  ldc.i4.0 
        IL_0014:  conv.u 
        IL_0015:  stloc.1 
        IL_0016:  ret  

==

 byte[] b = new byte[1024*1024];

                unsafe {
                        fixed (byte *p = &b[0]) {
                        }
                }