Repainting form

I am curious, how to "repaint a form", for ex.

I have a function Draw(float x1, float y1, float x2, float x3) , which draws a line from point A (x1,y1) to point B (x2,y2).

On the same form, I also have 4 textboxs, which I use to get the point coordinates for drawing a line. I'm trying to do, when I enter a coordinates and I press a button - previous line should dissapear and the new one should be created.

I'm using GDI+ of course, with Visual Studio.NET 2003.

If its just a line on a solid background why not redraw that same line in the background color before drawing the new one ?

.Invalidate() causes the control to repaint if that's what you're asking?

Yes, that's exacty what I was looking for...

Thanks!