Friday, 21 September 2012

DLL in VB 6.0,VB.Net,C#

Hi......
DLL statds for Dynamic Link Library which comprise Business logic .At A huge level of 
Software development it is suitable to implement business login separately. 
DLL provides facility of reversibility means  ones you have been created a DLL 
for a task then many project can use your DLL, Like if you have a DLL of
Calculator logic then many Application can use it after importing DLL ij their project...

DLL in VB 6.0
  • Open VB 6.0 and select ActiveXdll
  • Change your final project name as you're going to make otherwise you may be face problem of name contradiction because default name of dll project is Project 1 and VB Standard exe has also same so change name of dll project or standard exe project
  • On Project explorer window change of class1 as your requirement
  • now make some procedure and function of your logic as showing in following picture
  • Save DLL project
  • For make DLL select File > Make Project1 DLL...
  • Now your DLL is ready to use
Develop by Raj Kumar

How to use This DLL
  • Open VB 6.0
  • Select Standard EXE
  • For add a DLL in your project ..
  • Go to Project > Refereneces.
  • Browse Your DLL File and click open
  • Now you can use DLL class
  • Make an object of class which you have made in your DLL project
  • Call function of your DLL class using . operator
After import DLL you can use it at anywhere here is code which you can use on a button click event

Private Sub Command1_Click()
    Dim ob As New Class1
    ob.Show
    
End Sub

Private Sub Command2_Click()
    Dim ob As New Class1
    MsgBox (ob.Sum(10, 20))
End Sub
DLL in C# and VB.Net

  • Open Visual studio 2008 File > Project > Select class library form template
  • Implement your function and logic inside class body
  • After implementing logic press f6 for build your DLL Project
  • For use a DLL in windows Application right click of root folder from solution explorer
  • Add References..
  • Browse your project DLL
  • Now make an object of class which you have named in DLL file
Code of DLL my DLL file

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ClassLibrary1
{
    public class Class1
    {
        public int sum(int a,int b)
        {
            return a + b;
        }
    }
}


Code of window Application file where DLL has been used 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ClassLibrary1.Class1 ob = new ClassLibrary1.Class1();
            MessageBox.Show(ob.sum(10,20).ToString());
        }
    }
}