[C#]フォームを最前面・最背面に移動させる

 
private void Button1_Click(object sender, EventArgs e) {
    this.TopMost = true;
    this.TopMost = false;
}

[System.Runtime.InteropServices.DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
 
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
 
private void Button1_Click(object sender, EventArgs e) {
    IntPtr WinHandle = FindWindow(null, "Program Manager");
    if ( WinHandle != null ) {
        SetParent( this.Handle, WinHandle );
    }
}