Windows Forms controls are reusable components that encapsulate user interface functionality and are used in client side Windows applications. A Button is a control, which is an interactive component that enables users to communicate with an application which we click and release to perform some actions.
The Button control represents a standard button that reacts to a Click event. A Button can be clicked by using the mouse, ENTER key, or SPACEBAR if the button has focus.
When you want to change display text of the Button , you can change the Text property of the button.
Similarly if you want to load an Image to a Button control , you can code like this.
The following vb.net source code shows how to change the button Text property while Form loading event and to display a message box when pressing a Button Control.