Calling function from VB.Net Class

Question

Just wondering how I do this, Im creating a class that will have my common database functions. So for example I've created a function db_con in a class called db_functions.

How do i use that db_con function in for example my homepage vb code?

Do I import the class? I've tried typing the full class and method name, no joy so far?

Basic of the Basic questions I know :)

Answer 1

You import the namespace, not the class.

It sounds like you have created a class in the same namespace.

You need to create an instance of db_functions and call your function

Dim func as New db_functions
func.db_con()

It sounds like you are trying to call db_functions.db_con() , to do this create your function as a static function with the shared keyword as below

Public Shared Function db_con() As ReturnType
  .....
  Return Value
End Function  

If all your functions in that class are called that way and you never need an instance it should be a static class, in vb.net this is a Module (or therabouts).

Answer 2

This is what I just learned :
lets say we have:

1-Module1
2-class1
3-class2
4-function1()

and you want to call the function to in class2 :

1. If you create the function in the module as public, then you can call it just by the name:

   function1()

   that's what you write it in class2 or any class in the project

2. If you create the function in class1 and want to use it in class2 , now we have two ways to declare the function in class1 :

A- Public function1 (ByVal ---- as datatype ) as datatype
This make you have to create instance to use the function, like the follow:

dim ins as New class1
ins.function1()

that's what you write it in class2 or any class in the project,

B- Public Shared function1 ( ByVal ---- as datatype ) as datatype this make you don't need to use the instanse when you call the function,like the follow:

class1.function1()

That's what you write it in class2 It works with me