Fixes Form in Höhe und Breite verdoppeln, Inhalt skalieren

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        public int FormScaleFactor = 1;


        /// <summary>
        /// Form ggf. skalieren, wenn Bildschirmhöhe größer 640
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form_Shown(object sender, EventArgs e)
        {

            if (this.DesignMode) return;

            int intY = Screen.PrimaryScreen.Bounds.Height;
            if (intY >= 640)
            {
                FormScaleFactor = 2;

                this.SuspendLayout();

                //Font skalieren
                float currentSize = this.Font.SizeInPoints;
                currentSize = currentSize * FormScaleFactor;
                this.Font = new Font(this.Font.Name, currentSize,
                    this.Font.Style);

                //Form vergrößern
                this.Size = new Size(
                                this.Width * FormScaleFactor, 
                                this.Height * FormScaleFactor);

                //Controls des Forms skalieren
                foreach (Control ctrl in this.Controls)
                    ReSizeByFactor(ctrl);

                this.ResumeLayout();

            }
        }

        /// <summary>
        /// Skaliert ein Control und ruft rekursiv die Childcontrols auf
        /// </summary>
        /// <param name="ctrl">Control</param>
        /// <remarks>Faktor in FormScaleFactor</remarks>
        public void ReSizeByFactor(Control ctrl)
        {

            if (FormScaleFactor == 1) return;            

            DockStyle olddock = ctrl.Dock;
            AnchorStyles oldanchor = ctrl.Anchor;
            Point oldLocation = new Point(ctrl.Left, ctrl.Top);
           
            ctrl.Dock = DockStyle.None;
            ctrl.Anchor = AnchorStyles.None;

            ctrl.Size = new Size(
                ctrl.Width * FormScaleFactor, 
                ctrl.Height * FormScaleFactor);
            ctrl.Location = new Point(
                oldLocation.X * FormScaleFactor, 
                oldLocation.Y * FormScaleFactor);

            if (ctrl.Font != ctrl.Parent.Font)
            {
                //Font vergrößern, wenn Control eine eigene Schrift hat
                float currentSize = ctrl.Font.SizeInPoints;
                currentSize = currentSize * FormScaleFactor;
                ctrl.Font = new Font(ctrl.Font.Name, currentSize,
                    ctrl.Font.Style);
            }

            //bestimmte Control-Klassen noch gesondert behandeln
            if (ctrl is Button)
            {
                //Bild vergrößern 
                //Die Methode ResziePicByWitdh in anderem Snippet suchen!
                Button btn = ctrl as Button;
                if (btn.Image != null)
                    btn.Image = ResizePicByWidth(
                        btn.Image, btn.Image.Width * FormScaleFactor);
                if (btn.BackgroundImage != null)
                    btn.BackgroundImage = ResizePicByWidth(
                        btn.BackgroundImage, btn.BackgroundImage.Width * FormScaleFactor);
            }
            else if (ctrl is ListView)
            {
                ListView lst = ctrl as ListView;
                foreach (ColumnHeader clh in lst.Columns)
                {
                    clh.Width = clh.Width * FormScaleFactor;
                }
            }
            //else if (ctrl is ...)

            ctrl.Dock = olddock;
            ctrl.Anchor = oldanchor;

            //Rekursiv die enthaltenen Controls weiter skalieren
            foreach (Control ctrlchild in ctrl.Controls)
                ReSizeByFactor(ctrlchild);

        }