[VB.NET] Create DLL (Class Library) and Link to Main Application

Deskripsi
     Create a Class Library (.dll) and link to Main Application using Early Binding or Late Binding.

Howto

1. Create class library File :
- New Project > Class Library ( give name TestDLL, it will use as namespace)
- create simple class like this :

Imports System.Windows.Forms 'import this class , you will need any method

Public Class Myclass
    Public Sub MyMethod()
        MessageBox.Show("Hello World DLL")
    End Sub
End Class

save project and then Build > Build TestDLL , you can find the file TestDLL.dll at folder bin/release/


2. Create Main Application
- New Project > Windows Form Application (give name MyForm)
- to use Class Library , we have 2 method : Early Binding and Late Binding
   - Early binding means , we load the dll resource when Main Application Run , it will increase perfomance (speed) when access the Dll.
   - Late Binding means , we load the dll resource as we need so we use the memory as needed too.

* Early Binding
   - to use early binding just Project > Add Preference > find TestDLL.dll
   - Import the namespace after add refference :  import TestDLL
   - Dll are now linked , you can create an object now.
      Dim obj = New Myclass()
      obj.MyMethod()

* Late Binding
   - Late Binding we don't use refference , but we need the path of file dll. don't forget to drop the dll files into 1 folder with Main Application.
   - Linking to DLL  
     'Dim RefAssembly As Reflection.Assembly = Reflection.Assembly.LoadFrom("Filename.dll")
     Dim RefAssembly As Reflection.Assembly = Reflection.Assembly.LoadFrom("TestDLL.dll")
     'Dim obj As Object = RefAssembly.CreateInstance("Namespace.Class", IgnoreCase)
     Dim obj As Object = RefAssembly.CreateInstance("TestDLL.Myclass", True)
     obj.MyMethod()

Simple right ? hope it's help you :D