Dot NET winform control development (1) write the simplest Control

Use vs to create two projects (customcontrolsample, testcontrol). The project types are class libraries (Not underpants !!!), Windows applications.

1 using system. Windows. forms;
2 using system. drawing;
3
4 namespace customcontrolsample
5 {
6 public class firstcontrol: Control
7 {
8 private int simplefield;
9
10 public int simpleproperty
11 {
12 get {return simplefield ;}
13 set {simplefield = value ;}
14}
15
16 protected override void onpaint (painteventargs E)
17 {
18 base. onpaint (E );
19 E. Graphics. drawrectangle (pens. Red, new rectangle (point. Empty, new size (width-1, height-1 )));
20}
21}
22}

There is only one Property Control !!!

Drag to Windows form:

In the Property browser, you can see the unique property of the control:

A simple dot net winform control is ready.
The end.