Setting and Retrieving Properties
You can set their properties for forms and controls programmatically at run-time, or in design mode using the Properties window. The properties of most other objects, such as those from assemblies or objects you create, can only be set programmatically.
Properties are divided into 3 categories:
-
Properties you can set and read are called read-write properties.
-
Properties you can read but not modify are called read-only properties.
-
Properties you can write but not read are called write-only properties.
You get the value of a property when you want to find the state of an object before your code performs additional actions, such as assigning the value to another object. For example, you can return the Text property of a text box control to determine the contents of the text box before running specific code.
You set the value of a property when you want to change the appearance or behavior of an object. For example, you change the Visible property of a text box control to control whether the text box will display or not.
To Get property values
- Use the following syntax:
variable = object.property
To Set property values
- Use the following syntax:
object.property = expression
The following statements provide examples of how to set properties:
TextBox1.Top = 500 //Sets the Top property to 500 twips.
TextBox1.Text = "Hello World" //Displays *"Hello World* " in the text box.