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Copy Constructor in .NET

By Vijay Prativadi Nov 05 2012
Today, in this article let's play around with one of the interesting and most useful concept in .NET.
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Introduction

 

Today, in this article let's play around with one of the interesting and most useful concept in .NET.

 

Question: What is copy constructor?

 

In simple terms "It enables to copy the values into new object from existing object".

Step 1: Create a new WebForm project

New-project-in-VS.jpg

Step 2: The complete code of Arithmetic.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace Copy_ConstructorApp

{

    public class Arithmetic

    {

        public double a; public double b;

        public Arithmetic(Arithmetic arthmetic)

        {

            a = arthmetic.a; b = arthmetic.b;

        }

        public Arithmetic(double a, double b)

        {

            this.a = a; this.b = b;

        }

        public double Add()

        {

            return a + b;

        }

        public double Sub()

        {

            return a - b;

        }

        public double Mul()

        {

            return a * b;

        }

        public double Div()

        {

            return a / b;

        }

    }

}

 

Step 3: The complete code WebForm1.aspx looks like this:

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="Copy_ConstructorApp.WebForm1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <center>

        <div>

            <table>

                <tr>

                    <td colspan="2">

                        <asp:Label ID="Label1" runat="server" Text="Copy Constructor in .NET" Font-Bold="true"

                            Font-Size="Large" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label3" runat="server" Text="Please Enter First Number" Font-Size="Large"

                            Font-Names="Verdana" Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox1" runat="server" Width="120px"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td>

                        <asp:Label ID="Label2" runat="server" Text="Please Enter Second Number" Font-Size="Large"

                            Font-Names="Verdana" Font-Italic="true"></asp:Label>

                    </td>

                    <td>

                        <asp:TextBox ID="TextBox2" runat="server" Width="120px"></asp:TextBox>

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button1" runat="server" Text="Addition" Font-Names="Verdana" Width="213px"

                            BackColor="Orange" Font-Bold="True" OnClick="Button1_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button2" runat="server" Text="Substraction" Font-Names="Verdana"

                            Width="213px" BackColor="Orange" Font-Bold="True" OnClick="Button2_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button3" runat="server" Text="Multiplication" Font-Names="Verdana"

                            Width="213px" BackColor="Orange" Font-Bold="True" OnClick="Button3_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Button ID="Button4" runat="server" Text="Division" Font-Names="Verdana" Width="213px"

                            BackColor="Orange" Font-Bold="True" OnClick="Button4_Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2" align="center">

                        <asp:Label ID="Label5" runat="server" Font-Bold="true" Font-Names="Verdana" ForeColor="Maroon"></asp:Label>

                    </td>

                </tr>

            </table>

        </div>

    </center>

    </form>

</body>

</html>

 

Step 4: The complete code WebForm1.aspx.cs looks like this:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace Copy_ConstructorApp

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

        protected void Button1_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

            {

                Label5.Text = "Please Enter Some Values"; Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                Arithmetic obj_Arithmetic = new Arithmetic(double.Parse(TextBox1.Text), double.Parse(TextBox2.Text));

                Arithmetic obj_CopyArithmetic = new Arithmetic(obj_Arithmetic);

                Label5.Text = "Addition Result is: " + obj_CopyArithmetic.Add();

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = string.Empty; TextBox2.Text = string.Empty;

            }

        }

        protected void Button2_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

            {

                Label5.Text = "Please Enter Some Values"; Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                Arithmetic obj_Arithmetic = new Arithmetic(double.Parse(TextBox1.Text), double.Parse(TextBox2.Text));

                Arithmetic obj_CopyArithmetic = new Arithmetic(obj_Arithmetic);

                Label5.Text = "Substraction Result is: " + obj_CopyArithmetic.Sub();

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = string.Empty; TextBox2.Text = string.Empty;

            }

        }

        protected void Button3_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

            {

                Label5.Text = "Please Enter Some Values";

                Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                Arithmetic obj_Arithmetic = new Arithmetic(double.Parse(TextBox1.Text), double.Parse(TextBox2.Text));

                Arithmetic obj_CopyArithmetic = new Arithmetic(obj_Arithmetic);

                Label5.Text = "Multiplication Result is: " + obj_CopyArithmetic.Mul();

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = string.Empty; TextBox2.Text = string.Empty;

            }

        }

        protected void Button4_Click(object sender, EventArgs e)

        {

            if (string.IsNullOrEmpty(TextBox1.Text) || string.IsNullOrEmpty(TextBox2.Text))

            {

                Label5.Text = "Please Enter Some Values"; Label5.ForeColor = System.Drawing.Color.Red;

            }

            else

            {

                Arithmetic obj_Arithmetic = new Arithmetic(double.Parse(TextBox1.Text), double.Parse(TextBox2.Text));

                Arithmetic obj_CopyArithmetic = new Arithmetic(obj_Arithmetic);

                Label5.Text = "Division Result is: " + obj_CopyArithmetic.Div();

                Label5.ForeColor = System.Drawing.Color.Green;

                TextBox1.Text = string.Empty; TextBox2.Text = string.Empty;

            }

        }

    }

}

Step 5: The output of application looks like this:

Copy-constructor-in-.net.jpg

Step 6: The addition result output of application looks like this:

Copy-constructo-output-in-.net.jpg