C# と VB.NET の質問掲示板

C#だとこれであってますか？
[StructLayout(LayoutKind.Sequential)]
        private class comboBoxInfo
        {
            public int Size;
            public Rectangle RectItem;
            public Rectangle RectButton;
            public int ButtonState;
            public IntPtr ComboBoxHandle;
            public IntPtr EditBoxHandle;
            public IntPtr ListBoxHandle;
            public void New()
            {
                this.Size = Marshal.SizeOf(this);
            }
        }
        [DllImport("user32.dll")]
        private extern static bool GetComboBoxInfo(IntPtr hwindCombo, comboBoxInfo cbi);
        [DllImport("user32.dll")]
        private extern static int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
        [DllImport("user32.dll")]
        private extern static int GetWindowLong(IntPtr hWnd, int nIndex);
        private const int GWL_STYLE = -16;
        private const int ES_RIGHT = -8;

        private void SetRightAlign(ComboBox combo)
        {
            comboBoxInfo ci = new comboBoxInfo();
            if(!GetComboBoxInfo(combo.Handle, ci))
            {
                return;
            }
            if (ci.EditBoxHandle == IntPtr.Zero)
            {
                return;
            }
            int style = GetWindowLong(ci.EditBoxHandle, GWL_STYLE);
            SetWindowLong(ci.EditBoxHandle, GWL_STYLE, style); 
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            SetRightAlign(comboBox1);
        }