An object’s scope means its visibility to other classes, module, procedure etc. There are two types of scope in Visual Basic projects: variable scope and procedure scope.
Variable Scope :
There are three levels of variable scope in Visual Basic: at the procedure level, at the form or module level, and at the global level.
Visual Basic declaring statements:
| Keyword | Does this |
|---|---|
| Dim | Using Dim alone creates variants. Use the As keyword to specify a variable type. |
| Private | Makes variable available only in the current form/module |
| Public | Makes variable global—variable is available to the rest of program. |
| ReDim | Reallocates the memory for dynamic array variables. |
| Static | Variable preserves its value between procedure calls |
| Type | Declares a user type |
Procedure Scope :
You can restrict the scope of a procedure using keywords: Private, Public, Static, Friend.
Private: To make a procedure accessible in current Form/Module
Public: To make procedure global.
Friend: To make procedure available outside current Form but not outside current project.
Static: To make all variables of a function static.