How to draw pictures en c#...

use Graphic class in draw/ing namespace
then pass your form/panel.... instance to it

Graphic g= Form1.CreateGraphic(); //(or some thing like this..)

then u can call g and put dot ('.') after it and all function of drawing will appear .

you can crate pen from brushes and bruses from color ...(i'm not sure, you can see if you read tool tips)

Brush b = new SolidBrush(Color.Red);

Pen p = new Pen(brush 1);

and last thing...
if you need to keep data, and dpont let them destroy, first generate a buffer...
like:

Bitmap bmp=new Bitmap();

now instead of the thing i tol you above use:

Graphics g= Graphics.FromImage(bmp); //(i'm not sure... it's some thing like this)

//Draw codes
PictureBox1.Image=bmp;

in this form, you buffer data in Image style variable, and then pass this variable as an image to your image property of image Box...