On start-up taskbar covers full screen C# application

Question

I written a Kiosk style C# application using visual studio that is run on startup and should expand to full-screen and cover the task-bar.

I am doing the usual setting boarder style to none, and fill extents and it works perfectly if I just launch the application manually.

When the application launches on startup (by way of a short-cut in the startup folder in the start menu), the task-bar ends up on top of the program and clicking somewhere on the form does not bring the form back to the top.

Has anyone encountered this problem before, or know of possible workarounds.

Answer 1

I have also done this another time:

public class Screensize
{
    /// <summary>
    /// Selected Win AI Function Calls
    /// </summary>

    public class WinApi
    {
        [DllImport("user32.dll", EntryPoint = "GetSystemMetrics")]
        public static extern int GetSystemMetrics(int which);

        [DllImport("user32.dll")]
        public static extern void
            SetWindowPos(IntPtr hwnd, IntPtr hwndInsertAfter,
                         int X, int Y, int width, int height, uint flags);

        private const int SM_CXSCREEN = 0;
        private const int SM_CYSCREEN = 1;
        private static IntPtr HWND_TOP = IntPtr.Zero;
        private const int SWP_SHOWWINDOW = 64; // 0x0040

        public static int ScreenX
        {
            get { return GetSystemMetrics(SM_CXSCREEN); }
        }

        public static int ScreenY
        {
            get { return GetSystemMetrics(SM_CYSCREEN); }
        }

        public static void SetWinFullScreen(IntPtr hwnd)
        {
            SetWindowPos(hwnd, HWND_TOP, 0, 0, ScreenX, ScreenY, SWP_SHOWWINDOW);
        }
    }

    /// <summary>
    /// Class used to preserve / restore state of the form
    /// </summary>
    public class FormState
    {
        private FormWindowState winState;
        private FormBorderStyle brdStyle;
        private bool topMost;
        private Rectangle bounds;

        private bool IsMaximized = false;

        public void Maximize(Form targetForm)
        {
            if (!IsMaximized)
            {
                IsMaximized = true;
                Save(targetForm);
                targetForm.WindowState = FormWindowState.Maximized;
                targetForm.FormBorderStyle = FormBorderStyle.None;
                targetForm.TopMost = false;
                WinApi.SetWinFullScreen(targetForm.Handle);
            }
        }

        public void Save(Form targetForm)
        {
            winState = targetForm.WindowState;
            brdStyle = targetForm.FormBorderStyle;
            topMost = targetForm.TopMost;
            bounds = targetForm.Bounds;
        }

        public void Restore(Form targetForm)
        {
            targetForm.WindowState = winState;
            targetForm.FormBorderStyle = brdStyle;
            targetForm.TopMost = topMost;
            targetForm.Bounds = bounds;
            IsMaximized = false;
        }
    }

and just call in your form:

screensize.Maximize(this)

I think you mean this

And now I see this post is from 2013...