Basic Stuff
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The document discusses primitive and non-primitive data types in programming. Primitive types include integers and are declared with Dim and used directly. Non-primitive or object types include controls like TextBox, which must be declared as a type, instantiated with new, and then have properties and methods used, like setting the Text property. The document provides an example of declaring a TextBox named TextBox1, instantiating it, and accessing its Text property.
![Primitive and Non-primitive (Object) types Primitive types [Declaration] Dim x As Integer [Usage] x = 1 Non-Primitive types [Declaration] Dim y As TextBox [Instantiation] y = new TextBox( ) [Usage] y.Text = "my name" y.Visible = False](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-2-320.jpg)
![Primitive types [Declaration] Dim x As Integer](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-3-320.jpg)
![Primitive types [Usage] x = 1](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-4-320.jpg)
![Non-Primitive types [Declaration] Dim y As TextBox](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-5-320.jpg)
![Non-Primitive types [Instantiation] y = New TextBox( )](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-6-320.jpg)
![Non-Primitive types [Usage] y.Text = "Name"](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-7-320.jpg)
![Primitive and Non-primitive (Object) types Primitive types [Declaration] Dim x As Integer [Usage] x = 1 Special case: String is not primitive but is used like one Non-Primitive types [Declaration] Dim y As TextBox [Instantiation] y = new TextBox( ) [Usage] y.Text = "my name" y.Visible = False](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-8-320.jpg)
![What is TextBox1.Text? To use the control, we need to declare and instantiate . In Form1.Designer.vb: [Declaration] Friend WithEvents TextBox1 As System.Windows.Forms.TextBox [Instantiation] Me.TextBox1 = New System.Windows.Forms.TextBox](https://image.slidesharecdn.com/basicstuff-091101025445-phpapp02/85/Basic-Stuff-11-320.jpg)
Basic Stuff
- 1. Variables - Primitive & Non-Primitive types
- 2. Primitive and Non-primitive (Object) types Primitive types [Declaration] Dim x As Integer [Usage] x = 1 Non-Primitive types [Declaration] Dim y As TextBox [Instantiation] y = new TextBox( ) [Usage] y.Text = "my name" y.Visible = False
- 3. Primitive types [Declaration] Dim x As Integer
- 4. Primitive types [Usage] x = 1
- 5. Non-Primitive types [Declaration] Dim y As TextBox
- 6. Non-Primitive types [Instantiation] y = New TextBox( )
- 7. Non-Primitive types [Usage] y.Text = "Name"
- 8. Primitive and Non-primitive (Object) types Primitive types [Declaration] Dim x As Integer [Usage] x = 1 Special case: String is not primitive but is used like one Non-Primitive types [Declaration] Dim y As TextBox [Instantiation] y = new TextBox( ) [Usage] y.Text = "my name" y.Visible = False
- 10. What is TextBox1.Text? TextBox is a Control provided by Microsoft. It defines a Class with behaviours, properties and events. => later we shall use VS 2005 to view these behaviours, properties and events.
- 11. What is TextBox1.Text? To use the control, we need to declare and instantiate . In Form1.Designer.vb: [Declaration] Friend WithEvents TextBox1 As System.Windows.Forms.TextBox [Instantiation] Me.TextBox1 = New System.Windows.Forms.TextBox
- 12. What is TextBox1.Text? 1) View partial class Form1.Designer.vb 2) Right click on TextBox in " New System.Windows.Forms. TextBox " 3) Select Go To Definition
- 13. What is TextBox1.Text? behaviours / methods properties events TextBox1.Text