C# Definition:

    public struct WSADATA
    {
      public short wVersion;
      public short wHighVersion;
      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = WSADESCRIPTION_LEN + 1)]
      public string szDescription;
      [MarshalAs(UnmanagedType.ByValTStr, SizeConst = WSASYS_STATUS_LEN + 1)]
      public string szSystemStatus;
      [Obsolete] // Ignored for v2.0 and above
      public int wMaxSockets;
      [Obsolete] // Ignored for v2.0 and above
      public int wMAXUDPDG;
      public IntPtr dwVendorInfo;
    }

User-Defined Field Types:

None.

Notes:

dwVendorInfo is now unused (Winsock 2.0 and above)