visual basic

visual basic

1. FORMS

   • The forms are treated as controls with their properties, events and methods
     • The most common properties of forms:
       • -Caption, -Name, -Backcolor, -Forecolor,

2. TOOL BOX

   • shows icons for controls and other items that you can add to Visual Studio projects
     • it only shows the elements that are suitable for the type of file with which you are working

3. CONTROLS

   • In Visual Basic there are three general categories of controls
     • Intrinsic controls, ActiveX controls, Insertable objects

4. PROPERTIES OF OBJECTS

   • An important goal of many of the object-oriented programming languages is to allow you to encapsulate internal details in a class
     • Among its most usual properties are the following ones:
       • Text, BackColor, StartPosition, Size, BackGroundlmage, BackGroundlmageLayout, icon, MinimizeBox, AutoSize y AutoSizemode

5. CONTROL STRUCTURES

   • Control statement: are executed in a program is called the flow of control, in a sense, the computer is under the control of one statement at the time.

6. type of data

   • of a programming elements refers to what kind of data it can hold and how it stores that data.

7. Boolean

   • has only two states, true and false. These variable are they are usually used as flags or conditional.

8. Byte:

   • corresponds to an 8-bits variable that can store values of 0 to 255.

9. Double

   • is a 64-bits floating point number that is used when it need great precision.

10. Integer

    • is a 16-bit number, they should be used when working with non-fractional values.

11. Long

    • is a 32-bit number that can only contain integer values.

12. Decimal

    • is a subtype of Variant data, which can store very precise values ​​up to 28 decimals.

13. Single

    • is a 32-bit number, when fractional numbers are needed within this range, this is the type of appropriate for its use.

14. Currency

    • in use, it is scaled by a factor of 10,000 to add four digits to the right of the decimal point, allows up to 15 digits to the left of the decimal point.

15. String

    • is generally used as a type of length for a string of text, the maximum is 2 million characters.

16. Date

    • stores a numeric value with special format that represents both the date and the time.

17. Object

    • can point to any type of data, including any instance object that the application recognizes, is used when in the time of compilation is not known to what type of data the variable can indicate.