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4.5 ASSIGNING PROPERTY VALUES TO FORMS AND CONTROLS The properties associated with each object type are unique, though some, such as Name, BackColor (i.e., background color), Height and Width, are common to many different object types. The meaning of most properties is readily apparent. Some, however, require further explanation, particularly certain unique properties that are required for an object s special behavior. For information about such properties, you should consult the on-line help (press F1 or click on the Help menu), related example projects, or printed reference material. Moreover, each object will have a unique set of values assigned to its properties. These values may be assigned at design time (i.e., when the object is first defined, before the application is executed), or at run time (i.e., while the application is executing). Design-time assignments are made by selecting a property from the list of properties shown in the Properties Window (see Fig. 1.3), and then either choosing an appropriate value from the adjoining list of values or entering a value from the keyboard. These property values will apply when the application first begins to run. Run-time assignments are carried out using Visual Basic assignment commands, as described in Chap. 2. In general terms, a property assignment is written as object_name.property = value where object_name refers to the name of the form or control, property refers to the associated property name, and value refers to an assignable item, such as a number or a string. The net effect is to assign the value on the right-hand side of the equal sign to the property on the left. Such assignments can provide initial values to properties that were formerly undefined, or they may replace previous assignments.
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EXAMPLE 4.1 ASSIGNING VALUES TO PROPERTIES
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Each of the following commands assigns a run-time value to a text box property.
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Text1.Text = "Welcome to Visual Basic" txtMessage.Text = "Welcome to Visual Basic" txtMessage.Height = 300
The first line assigns the string Welcome to Visual Basic to the Text property associated with text box Text1 (default name). The second line assigns this same string to the Text property associated with text box txtMessage (programmerassigned name). The last line assigns a numerical value to the Height property associated with txtMessage. Each of these commands either assigns a new value during program execution, or replaces a previously assigned initial value (i.e., a value assigned during design time).
4.6 EXECUTING COMMANDS (EVENT PROCEDURES AND COMMAND BUTTONS) An event procedure is an independent group of commands that is executed whenever an event occurs during program execution. Typically, an event occurs when the user takes some action, such as clicking on a control icon, or dragging an icon to another location. Many (though not all) Visual Basic controls have event procedures associated with them. Each event procedure begins with a Sub statement, such as Private Sub Command1_Click(), and ends with an End Sub statement. Between the Sub and End Sub statements is a group of instructions, such as those discussed in the last two chapters, that are executed when the user initiates the corresponding event. The parentheses in the Sub statement may contain arguments special variables that are used to transfer information between the event procedure and the calling routine (see Chap. 7 for more information on this topic). Command buttons are often used to execute Visual Basic event procedures. Thus, when the user clicks on a command button during program execution, the statements within the corresponding event procedure are carried out. The statements within the event procedure may involve the properties of controls other than the command button. For example, a command-button event procedure may result in new values being assigned to the properties of a label or a text box.
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