How to hide and unhide taskbar in C #?

As they said, it is very complicated to do, but not impossible. Add a new class with the following code:

using System; using System.Runtime.InteropServices;

public class Taskbar
{
    [DllImport("user32.dll")]
    private static extern int FindWindow(string className, string windowText);

    [DllImport("user32.dll")]
    private static extern int ShowWindow(int hwnd, int command);

    [DllImport("user32.dll")]
    public static extern int FindWindowEx(int parentHandle, int childAfter, string className, int windowTitle);

    [DllImport("user32.dll")]
    private static extern int GetDesktopWindow();

    private const int SW_HIDE = 0;
    private const int SW_SHOW = 1;

    protected static int Handle
    {
        get
        {
            return FindWindow("Shell_TrayWnd", "");
        }
    }

    protected static int HandleOfStartButton
    {
        get
        {
            int handleOfDesktop = GetDesktopWindow();
            int handleOfStartButton = FindWindowEx(handleOfDesktop, 0, "button", 0);
            return handleOfStartButton;
        }
    }

    private Taskbar()
    {
        // hide ctor
    }

    public static void Show()
    {
        ShowWindow(Handle, SW_SHOW);
        ShowWindow(HandleOfStartButton, SW_SHOW);
    }

    public static void Hide()
    {
        ShowWindow(Handle, SW_HIDE);
        ShowWindow(HandleOfStartButton, SW_HIDE);
    }
}

Show () shows and Hide () hidden.

Hiding the unhide task is a tricky thing, mainly because it's not something applications can simply go around doing. Otherwise it would be easy to make it a mess.

What you want is to keep your application screen full and this is very simple . It is only necessary to maximize form , remove the borders and set the TopMost property to true .

Example:

// colocar o form em full screen
private void btFullScreen_Click(object sender, EventArgs e)
{
    TopMost = true;
    FormBorderStyle = FormBorderStyle.None;
    WindowState = FormWindowState.Maximized;
}

// Voltar ao estado normal (barra tarefas aparecendo)
private void btRestaurar_Click(object sender, EventArgs e)
{
    TopMost = false;
    FormBorderStyle = FormBorderStyle.FixedSingle; // ou a que estava antes
}