C# - Why won't a fullscreen winform app ALWAYS cover the taskbar?

Question

I\'m using Windows Vista and C#.net 3.5, but I had my friend run the program on XP and has the same problem.

So I have a C# program that I have running in the backgr

Answer 1

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.F11)
        if (FormBorderStyle == FormBorderStyle.None)
        {
            FormBorderStyle = FormBorderStyle.Sizable;
            WindowState = FormWindowState.Normal;
        }
        else
        {
            SuspendLayout();
            FormBorderStyle = FormBorderStyle.None;
            WindowState = FormWindowState.Maximized;
            ResumeLayout();
        }
}