Implementing data updates for Windows programs

Enumerations are a descriptive set of names
Define a limited set of values that do not contain methods
To constrain a possible value
An enumeration is a specified set of constants that constrain the possible values
Enumeration is intuitive and easier to maintain when used

PictureBox controls
Property name Description
Image to display in space
SizeMode How to handle the size relationship of images and controls

Timer Control Timer
Timer control (timer) properties and events
Property name Description
The frequency, in milliseconds, that the interval event occurred
Whether enabled timing raises time
Event name Description
Tick events that occur periodically

The index variable definition and initialization cannot be written in the Tick event handler, otherwise the picture cannot be rotated

To display a picture on a form using the PictureBox control
Use the time control to allow the program to do something repeatedly
Forms have two display method modes: Modal and non-modal forms

Implementing data updates for Windows programs