ARTICLE

Lets Play Around With Builder Design Pattern

Posted by Vijay Prativadi Articles | Design & Architecture June 10, 2012
Today, in this article let’s play around with one of the interesting and most useful concepts of design patterns, which will be hosted on a web app.
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Introduction
 

Today, in this article let's play around with one of the interesting and most useful concepts of design patterns, which will be hosted on a web app.
 
Question: What is Builder Pattern?

 

In simple terms "This patterns helps the construction of an object and its representations from a complex, cluttered environment to a simple, easy and understandable format. With the help of this pattern we can customize our objects and can be used accordingly towards the requirements".

 

I think we are now good to go and implement this wonderful concept.

 

Step 1: The complete code of Default.aspx looks like this:

 

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

 

<!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">

    <div>

        <h1 style="text-align: center; font-family: Verdana; font-size: large; color: Maroon">

            Builder Pattern - Design Patterns</h1>

        <center>

            <table>

                <tr>

                    <td>

                        <asp:Label ID="Label1" runat="server" Text="Please Enter First Number" Font-Size="Small"

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

                    </td>

                    <td>

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

                    </td>

                </tr>

                <tr>

                    <td>

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

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

                    </td>

                    <td>

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

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button1" runat="server" Text="Addition" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button1Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button2" runat="server" Text="Subtraction" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button2Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button3" runat="server" Text="Multiplication" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button3Click" />

                    </td>

                </tr>

                <tr>

                    <td colspan="2">

                        <asp:Button ID="Button4" runat="server" Text="Division" Width="165px" Font-Names="Verdana"

                            BackColor="Orange" OnClick="Button4Click" />

                    </td>

                </tr>

            </table>

            <table>

                <tr>

                    <td colspan="2">

                        <asp:Label ID="lblResult" runat="server" Font-Names="Verdana"></asp:Label>

                    </td>

                </tr>

            </table>

        </center>

    </div>

    </form>

</body>

</html>

 

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

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace BuilderDesignPatternApp

{

    public interface IArthmetic { double Arthmetic(double a, double b);}

}

 

Step 3: The complete code of Addition.cs looks like this:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

    public class Addition : IArthmetic { public double Arthmetic(double a, double b) { return a + b; } }

}

 

Step 4: The complete code of Subtraction.cs looks like this:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

    public class Substraction : IArthmetic { public double Arthmetic(double a, double b) { return a - b; } }

}

 

Step 5: The complete code of Multiplication.cs looks like this:
 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

    public class Multiplication : IArthmetic {
    public double Arthmetic(double a, double b)
   {
     return a * b;
    }
  }

}

 

Step 6: The complete code of Division.cs looks like this:
 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

namespace BuilderDesignPatternApp

{

    public class Division : IArthmetic { public double Arthmetic(double a, double b) { return a / b; } }

}

 

Step 7: The complete code of Default.aspx.cs looks like this:

 

using System;

using System.Globalization;namespace BuilderDesignPatternApp

{

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

{

    protected void Page_Load(object sender, EventArgs e)

    {

        TextBox1.Focus();

    }

    protected void Button1Click(object sender, EventArgs e)

    {

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

        {

            lblResult.Text = "Please Enter Some Values";

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

        }

        else

        {

            lblResult.Text = "Addition Result of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>" + DoArthmetic(_objAddition).ToString(CultureInfo.InvariantCulture) + "</b>";

            lblResult.ForeColor = System.Drawing.Color.Black;TextBox1.Text = "";

            TextBox2.Text = "";

        }

    }

    protected void Button2Click(object sender, EventArgs e)

    {

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

        {

            lblResult.Text = "Please Enter Some Values";

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

        }

        else

        {

            lblResult.Text = "Substraction Result of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>" + DoArthmetic(_objSubstraction).ToString(CultureInfo.InvariantCulture) + "</b>";

            lblResult.ForeColor = System.Drawing.Color.Black;TextBox1.Text = "";

            TextBox2.Text = "";

        }

    }

    protected void Button3Click(object sender, EventArgs e)

    {

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

        {

            lblResult.Text = "Please Enter Some Values";

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

        }

        else

        {

            lblResult.Text = "Multiplication Result of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>" + DoArthmetic(_objMultiplication).ToString(CultureInfo.InvariantCulture) + "</b>";

            lblResult.ForeColor = System.Drawing.Color.Black;TextBox1.Text = "";

            TextBox2.Text = "";

        }

    }

    protected void Button4Click(object sender, EventArgs e)

    {

        lblResult.Text = "";

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

        {

            lblResult.Text = "Please Enter Some Values";

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

        }

        else{lblResult.Text = "Division Result of <b>" + TextBox1.Text + "</b> and <b>" + TextBox2.Text +"</b> is <b>"+DoArthmetic(_objDivision).ToString(CultureInfo.InvariantCulture)+"</b>";

            lblResult.ForeColor = System.Drawing.Color.Black;

            TextBox1.Text = "";

            TextBox2.Text = "";

        }

   

        private double DoArthmetic(IArthmetic arthmetic)

        {

            double d = arthmetic.Arthmetic(Convert.ToDouble(TextBox1.Text), Convert.ToDouble(TextBox2.Text));

            return d;

        }

    #region

    Private Instance Variblesprivate readonly IArthmetic _objAddition = new Addition();

    private readonly IArthmetic _objSubstraction = new Substraction();

    private readonly IArthmetic _objMultiplication = new Multiplication();

    private readonly IArthmetic _objDivision = new Division();#endregion

}

}

 

Step 8: The output of the application looks like this:


 

Output1.png
 

 

Step 9: The output of the nothing entered application looks like this:


 

Output2.png
 

 

Step 10: The output of the addition operation application looks like this:


 

Output3.png
 

 

Step 11: The output of the multiplication operation application looks like this:

  Output4.png

I hope this article is useful for you.

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