C# Definition:

    [StructLayout(LayoutKind.Sequential)]
    struct INITCOMMONCONTROLSEX
    {
        public int dwSize;
        public uint dwICC;
    }

C# Definition:

    [StructLayout(LayoutKind.Sequential)]
    public struct INITCOMMONCONTROLSEX
    {
        private int dwSize;
        public uint dwICC;

        public INITCOMMONCONTROLSEX()
        {
            dwSize = Marshal.SizeOf(typeof(INITCOMMONCONTROLSEX));
            dwICC = 0;
        }

        public INITCOMMONCONTROLSEX(uint dwICC)
            : this()
        {
            this.dwICC = dwICC;
        }

        public INITCOMMONCONTROLSEX(CommonControls ICC)
            : this((uint)ICC)
        { }

        public CommonControls ICC
        {
            get { return (CommonControls)dwICC; } set { dwICC = (uint)value; }
        }
    }

VB Definition:

    <StructLayout(LayoutKind.Sequential)> _
    Public Structure INITCOMMONCONTROLSEX
        Public dwSize As Integer
        Public dwICC As System.UInt32
    End Structure

VB Definition:

    <StructLayout(LayoutKind.Sequential)> _
    Public Structure INITCOMMONCONTROLSEX
        Private dwSize As Integer
        Public dwICC As UInteger

        Public Sub New()
            dwSize = Marshal.SizeOf(GetType(INITCOMMONCONTROLSEX))
            dwICC = 0
        End Sub

        Public Sub New(dwICC As UInteger)
            Me.New()
            Me.dwICC = dwICC
        End Sub

        Public Sub New(ICC As CommonControls)
            Me.New(CUInt(ICC))
        End Sub

        Public Property ICC() As CommonControls
            Get
                Return DirectCast(dwICC, CommonControls)
            End Get
            Set
                dwICC = CUInt(value)
            End Set
        End Property
    End Structure

User-Defined Field Types (C#):

    public enum CommonControls : uint
    {
     ICC_LISTVIEW_CLASSES   = 0x00000001, // listview, header
     ICC_TREEVIEW_CLASSES   = 0x00000002, // treeview, tooltips
     ICC_BAR_CLASSES    = 0x00000004, // toolbar, statusbar, trackbar, tooltips
     ICC_TAB_CLASSES    = 0x00000008, // tab, tooltips
     ICC_UPDOWN_CLASS       = 0x00000010, // updown
     ICC_PROGRESS_CLASS     = 0x00000020, // progress
     ICC_HOTKEY_CLASS       = 0x00000040, // hotkey
     ICC_ANIMATE_CLASS      = 0x00000080, // animate
     ICC_WIN95_CLASSES      = 0x000000FF,
     ICC_DATE_CLASSES       = 0x00000100, // month picker, date picker, time picker, updown
     ICC_USEREX_CLASSES     = 0x00000200, // comboex
     ICC_COOL_CLASSES       = 0x00000400, // rebar (coolbar) control
     ICC_INTERNET_CLASSES   = 0x00000800,
     ICC_PAGESCROLLER_CLASS = 0x00001000,  // page scroller
     ICC_NATIVEFNTCTL_CLASS = 0x00002000,  // native font control
     ICC_STANDARD_CLASSES   = 0x00004000,
     ICC_LINK_CLASS     = 0x00008000
    }

User-Defined Field Types (VB.NET):

Public Enum CommonControls As UInteger
    ICC_LISTVIEW_CLASSES = &H1
    ' listview, header
    ICC_TREEVIEW_CLASSES = &H2
    ' treeview, tooltips
    ICC_BAR_CLASSES = &H4
    ' toolbar, statusbar, trackbar, tooltips
    ICC_TAB_CLASSES = &H8
    ' tab, tooltips
    ICC_UPDOWN_CLASS = &H10
    ' updown
    ICC_PROGRESS_CLASS = &H20
    ' progress
    ICC_HOTKEY_CLASS = &H40
    ' hotkey
    ICC_ANIMATE_CLASS = &H80
    ' animate
    ICC_WIN95_CLASSES = &Hff
    ICC_DATE_CLASSES = &H100
    ' month picker, date picker, time picker, updown
    ICC_USEREX_CLASSES = &H200
    ' comboex
    ICC_COOL_CLASSES = &H400
    ' rebar (coolbar) control
    ICC_INTERNET_CLASSES = &H800
    ICC_PAGESCROLLER_CLASS = &H1000
    ' page scroller
    ICC_NATIVEFNTCTL_CLASS = &H2000
    ' native font control
    ICC_STANDARD_CLASSES = &H4000
    ICC_LINK_CLASS = &H8000
End Enum

Notes:

None.