Sample Struct

[StructLayout(LayoutKind.Sequential, Pack = 1)]
        public unsafe struct _IMAGE_DOS_HEADER {      // DOS .EXE header
            public WORD e_magic;                     // Magic number
            public WORD e_cblp;                      // Bytes on last page of file
            public WORD e_cp;                        // Pages in file
            public WORD e_crlc;                      // Relocations
            public WORD e_cparhdr;                   // Size of header in paragraphs
            public WORD e_minalloc;                  // Minimum extra paragraphs needed
            public WORD e_maxalloc;                  // Maximum extra paragraphs needed
            public WORD e_ss;                        // Initial (relative) SS value
            public WORD e_sp;                        // Initial SP value
            public WORD e_csum;                      // Checksum
            public WORD e_ip;                        // Initial IP value
            public WORD e_cs;                        // Initial (relative) CS value
            public WORD e_lfarlc;                    // File address of relocation table
            public WORD e_ovno;                      // Overlay number
            [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 4, ArraySubType = System.Runtime.InteropServices.UnmanagedType.I2)]
            public WORD[] e_res;                     // Reserved words
            public WORD e_oemid;                     // OEM identifier (for e_oeminfo)
            public WORD e_oeminfo;                   // OEM information; e_oemid specific
            [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 10, ArraySubType = System.Runtime.InteropServices.UnmanagedType.I2)]
            public WORD[] e_res2;                     // Reserved words
            public LONG e_lfanew;                    // File address of new exe header
            //
            public _IMAGE_DOS_HEADER(int nFakeArgs) {
                this.e_cblp = this.e_cp = this.e_cparhdr = this.e_crlc = 0;
                this.e_cs = this.e_csum = this.e_ip = this.e_lfarlc = 0;
                this.e_magic = this.e_maxalloc = this.e_minalloc = this.e_oemid = 0;
                this.e_oeminfo = this.e_ovno = this.e_sp = this.e_ss = 0;
                this.e_lfanew = 0;
                this.e_res = new WORD[4];
                this.e_res2 = new WORD[10];
            }
            public _IMAGE_DOS_HEADER(byte[] data)
                : this(0) {
                unsafe {
                    GCHandle hImgDosHdr = GCHandle.Alloc(data, GCHandleType.Pinned);
                    IntPtr pImgDosHdr = hImgDosHdr.AddrOfPinnedObject();
                    this = (_IMAGE_DOS_HEADER)Marshal.PtrToStructure(pImgDosHdr, this.GetType());
                    hImgDosHdr.Free();
                }
            }
        };