Add a ruler to C #. The scale of the ruler is centimeter.

1 protected override void onpaint (painteventargs E)
2 {
3 form1 frm1 = new form1 ();
4 graphics G = E. graphics;
5
6 For (INT I = 0; I <= frm1.width; I ++ = 5)
7 {
8 if (I % 25! = 0 & I % 50! = 0)
9 {
10g. drawline (new pen (New solidbrush (color. Red), 1), new point (I, 0), new point (I, 4 ));
11}
12
13 if (I % 25 = 0 & I % 50! = 0)
14 {
15g. drawline (new pen (New solidbrush (color. Red), 1), new point (I, 0), new point (I, 7 ));
16}
17
18 if (I % 50 = 0)
19 {
20G. drawline (new pen (New solidbrush (color. Red), 1), new point (I, 0), new point (I, 9 ));
21}
22
23 if (I % 25! = 0 & I % 50! = 0)
24 {
25G. drawline (new pen (New solidbrush (color. Red), 1), new point (0, I), new point (4, I ));
26}
27
28 if (I % 25 = 0 & I % 50! = 0)
29 {
30g. drawline (new pen (New solidbrush (color. Red), 1), new point (0, I), new point (7, I ));
31}
32
33 if (I % 50 = 0)
34 {
35g. drawline (new pen (New solidbrush (color. Red), 1), new point (0, I), new point (9, I ));
36}
37}
38
39 base. onpaint (E );
40}