Call a Function in VB

Stuck with concepts of "Function" in VB ? If Yes, read this guide to learn the so called constructs of "Function" in the paradigm of VB.

Steps

  1. What is Function ?
    • Use a Function procedure when you need to return a value to the calling code.
    • A function itself has a type, and the function will return a value to the calling subroutine based on the code that it contains.
  2. How to declare Function ?
    • You can define a Function procedure only at module level. This means the declaration context for a function must be a class, structure, module, or interface, and cannot be a source file, namespace, procedure, or block.
    • A function is declared the exact same way as a subroutine, except using the "Function" keyword instead of "Sub".
    • Function procedures default to public access. You can adjust their access levels with the access modifiers.
  3. How to call Function ?
    • You call a Function procedure by using the procedure name, followed by the argument list in parentheses, in an expression.
    • You can omit the parentheses only if you are not supplying any arguments. However, your code is more readable if you always include the parentheses.
    • A function can also be called using the Call statement, in which case the return value is ignored.
    • To return a value, assign a value of the proper type to the function's name, as if it were a variable.

Syntax

Declaration 

[ <attributelist> ] [ accessmodifier ] [ proceduremodifiers ] [ Shared ]
Function name [ (Of typeparamlist) ] [ (parameterlist) ] [ As returntype ]
    [ statements ]
    [ Exit Function ]
    [ statements ]
End Function

Calling 

'Without Call
Function_Name()
    
'With Call
Call Function_Name()

Example

An example of function that adds two numbers is shown below

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