Toggle the visibility of the Soft Input Panel button on Windows CE Mobile

SoftwareInputPanel.Button.cs

using System;
using System.Runtime.InteropServices;

/// <summary>
/// Toggle the visibility of the Soft Input Panel button
/// Source: http://beemobile4.net/support/technical-articles/windows-mobile-programming-tricks-on-net-compact-framework-12
/// </summary>
namespace SoftwareInputPanel
{
    class Button
    {
        [DllImport("coredll.dll", SetLastError = true)]
        private static extern IntPtr FindWindow(string caption, string className);

        [DllImport("coredll.dll", SetLastError = true)]
        private static extern bool ShowWindow(IntPtr hwnd, int state);

        [DllImport("coredll.dll")]
        private static extern IntPtr GetWindow(IntPtr hWnd, uint uCmd);

        private const int SW_HIDE = 0;
        private const int SW_SHOW = 1;
        private const int GW_CHILD = 5;
        
        ///          
        /// Shows the SIP (Software Input Panel) button.         
        ///
        static private void ShowHide(int nShowOrHide)
        {
            IntPtr hSipWindow = FindWindow("MS_SIPBUTTON", "MS_SIPBUTTON");
            if (hSipWindow != IntPtr.Zero)
            {
                IntPtr hSipButton = GetWindow(hSipWindow, GW_CHILD);
                if (hSipButton != IntPtr.Zero)
                {
                    bool res = ShowWindow(hSipButton, nShowOrHide);
                }
            }
        }

        /// <summary>
        /// Show the SIP button
        /// </summary>
        static public void Show()
        {
            ShowHide(SW_SHOW);
        }

        /// <summary>
        /// Hide the SIP button
        /// </summary>
        static public void Hide()
        {
            ShowHide(SW_HIDE);
        }
    }
}