Visual Basic

Visual Basic

1. Forms

   • The form is the first object or control that is displayed in Visual Basic and constitutes the screen or window over which other objects or controls are placed such as labels, text controls, buttons, etc. and of course the necessary code of our programs, therefore will constitute the User Interface
   • most common properties
     • Name
       • In all control the first property to be established is the name of the object, it is recommended that in the case of the form the first three letters are Frm, precisely to know that it is a form, and then followed by the name that you want to assign , does not admit spaces.
     • BackColor
       • Allows you to change the color of the form's background
     • Cursor
       • Cursor that will appear when the pointer passes through the form, will be displayed only at run time (f5)
     • BackColor
       • Allows you to change the color of the form's background
     • Icon
       • Indicates the icon of the form ie the one that goes in the title bar, it will also be displayed in the windows taskbar when the form is minimized
     • MaximizeBox
       • Allows the maximize button found on the control buttons to be enabled or not (can be used or not)
     • ShowIcon
       • Indicates whether an icon is displayed or not in the title bar of the form

2. Tool Box

   • The Toolbox window shows the controls that you can add to Visual Studio projects

3. controls

   • Intrinsic controls
     • These controls are located within the Visual Basic executable file. Intrinsic controls are always included in the toolbox, not like Activex controls, which can be removed or added to the toolbox. Below is a list of intrinsic controls.
   • ActiveX controls
     • Are those controls that exist as independent files with extension file name .ocx. These include the controls available in all editions of Visual Basic (grid controls, combo box and list linked to data and several others) and those that are only available in the Professional Edition and Enterprise Edition (such as Listview, Toolbar, Animation and Tabbed Dialog). To these are also added ActiveX controls from other manufacturers.
     • Are those controls that exist as independent files with extension file name .ocx. These include the controls available in all editions of Visual Basic (grid controls, combo box and list linked to data and several others) and those that are only available in the Professional Edition and Enterprise Edition (such as Listview, Toolbar, Animation and Tabbed Dialog). To these are also added ActiveX controls from other manufacturers.

4. Properties of Objects

5. control structures

   • This structure allows us to control, through a condition and execution or not of a line or set of code lines
   • While-When
     • this structure will repeat without determining determining codes while a condition is fulfilled
   • Select-Case
     • the select clause evaluates a condition and the clauses case contains values
   • IN-THEN-ELSE
     • allows through a condition that is executed or not determined task or line of code

6. Type of data

   • Long
   • Decimal
   • Single
   • Interger
   • Double
   • Byte:
   • Boolean
   • String
   • Currency

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