AIM :  Design an application that uses the user defined Dynamic Link Library in Window Application.

Source Code :

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;

using ClassLibrary1;

 

namespace WindowsFormsApplication1

{

    public partial class Form1 : Form

    {

        int a, b, c;

        Class1 o = new Class1();

        public Form1()

        {

            InitializeComponent();

        }

 

// Addition

        private void button1_Click(object sender, EventArgs e)

        {

 

            a = Int32.Parse(textBox1.Text);

            b = Int32.Parse(textBox2.Text);

            c = o.add(a,b);

            MessageBox.Show("Addition is "+c.ToString());  

        }

// Subtraction

        private void button2_Click(object sender, EventArgs e)

        {

            a = Int32.Parse(textBox3.Text);

            b = Int32.Parse(textBox4.Text);

            c = o.sub(a,b);

            MessageBox.Show("Subtraction is " + c.ToString());

        }

 

 

//  Swaping

 

        private void button3_Click(object sender, EventArgs e)

        {

            a = Int32.Parse(textBox5.Text);

            b = Int32.Parse(textBox6.Text);

            o.swap(ref a,ref b);

            textBox5.Text = a.ToString();

            textBox6.Text = b.ToString();

        }

// Factorial

        private void button4_Click(object sender, EventArgs e)

        {

            b = Int32.Parse(textBox7.Text);

            c=o.fact(b);

            MessageBox.Show("Factorial is " + c.ToString());

        }

     

    }

}

 

// Class Liberary

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace ClassLibrary1

{

    public class Class1

    {

        public int add(int a, int b)

        {

            return (a + b);

        }

        public int sub(int a, int b)

        {

            return (a - b);

        }

        public void swap(ref int a, ref int b)

        {

            int c;

            c = a;

            a = b;

            b = c;

        }

        public int fact(int b)

        {

            int a = 1;

            for (int i = b; i > 0; i--)

            {

                a = a * i;

            }

            return a;

        }

    }

}

Output