Draw persistent grid in TabPage (.Net, C#) -

i need display persistent grid in tabpage. problems instantly solved if draw entire non-visible portion of tabpage , prevent graphics being erased when scrolling.

the other solution can think of tracking scroll position in tab , basing grid drawn that.

to draw in first place, had create eventhandler tabpage.paint.

    //code removed 

this method draws vertical , horizontal lines create grid within visible tab, continues draw whenever paint event occurs (i.e. scrolling), creates overlapping lines , aren't aligned size of current visible area of tab.

maybe work you:

public partial class form1 : form {     public form1()     {         initializecomponent();          const int gridspacing = 20;         const int linethickness = 1;         bitmap bmp = new bitmap(gridspacing, gridspacing);         using (system.drawing.pen pen = new system.drawing.pen(color.blue, linethickness))         {             using (graphics g = graphics.fromimage(bmp))             {                 g.clear(this.backcolor);                 g.drawline(pen, 0, bmp.height - pen.width, bmp.width, bmp.height - pen.width); // horizontal                 g.drawline(pen, bmp.width - pen.width, 0, bmp.width - pen.width, bmp.height); // vertical             }         }          foreach (tabpage tp in tabcontrol1.tabpages)         {             tp.backgroundimage = bmp;             tp.backgroundimagelayout = imagelayout.tile;         }     } }