i want to abtain remote screen capture on the pc in LAN.
i was suggested to transmit the changed parts only to save the bandwidth.
so i divide the screen into 10*10 parts. and now , i need to display the
remote screen on my own form. my method is use this:

Graphics c = this.createGraphics();
c.drawImage(imageparts,xcoodinary,ycoodinary);// imageparts is ONE part
                                             // of the screen  (1/100)

whenever i receive a imageparts, i use the code above to draw the changed
screen parts on a FORM. the code seems to work well.In the first time,i
should call this code 100 times to get the original screen.after then , i
could only call this code several times.

but now ,when the FORM is changed or covered by other windows , with the
repaint result ,the image  disappeared or changed into a wrong display.

So i should put the code above into OnPaint method. but the code above only
redraws the changed parts of the remote screen, the others disappeared.

How can i redraw the previous unchanged image already on the FORM ? OR are
there other methods to solve this problem ?

THX!