object orinented programming in c# using controls

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Create a Formfor a restaurant. Allow the user to choose one
item from at least three options in each of the following
categories—appetizer, entrée, and dessert. Assign a different
price to each selection and display the total when the user
clicks a Button. Use the Controls that you think are best
for each function. Label items appropriately and use fonts
and colors to achieve an attractive design. Save the project
as Restaurant.

C#

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

namespace WindowsFormsApplication14

{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }
        private void comboBox1_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            {
                if (comboBox3.SelectedIndex == 0)
                {
                    double dessertPrice = 3.00;
                }
                else if (comboBox3.SelectedIndex == 1)
                {
                    double dessertPrice = 2.00;
                }
                else if (comboBox3.SelectedIndex == 2)
                {
                    double dessertPrice = 2.50;
                }
                else
                {
                    double dessertPrice = 2.00;
                }
            }
        }

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (comboBox2.SelectedIndex == 0)
{
double entreePrice = 25.00;
}
else if (comboBox2.SelectedIndex == 1)
{
double entreePrice = 15.00;
}
else if (comboBox2.SelectedIndex == 2)
{
double entreePrice = 12.00;
}
else
{
double entreePrice = 20.00;
}
}

        private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
        {
        if (comboBox1.SelectedIndex == 0)
{
double appetizerPrice = 3.00;
}
else if (comboBox1.SelectedIndex == 1)
{
double appetizerPrice = 5.00;
}
else if (comboBox1.SelectedIndex == 2)
{
double appetizerPrice = 3.00;
}
else
{
double appetizerPrice = 3.00;
}
}

private void button1_Click_1(object sender, EventArgs e)
{
    MessageBox.Show("Your total is {0}.");
}
 }
  }

just help me making this program complete! i don't know what should be the total price ?

Posted 14-Jul-13 6:09am

Mudassar Naeem

Updated 14-Jul-13 6:10am

v2

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Comments

[no name] 14-Jul-13 12:16pm

Wow... okay I believe that the easiest thing for you to do would be to make your prices class level variables or properties so that they are available to your , I assume it's a Total, button click handler. Re-read your textbook about variable scope as you have made all of your prices local to your SelectedIndexChanged event handlers and once that is finished, you do not have a price anymore.

Mudassar Naeem 14-Jul-13 12:24pm

I Have used this but it didn't working
double total = Form1.comboBox3.SelectedIndexChanged.dessert + Form1.comboBox2.SelectedIndexChanged.entree + Form1.comboBox1.SelectedIndexChanged.appetizer

[no name] 14-Jul-13 12:31pm

No and that would never work.

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Reza Alipour Fard · Accepted Answer · 2013-07-14T08:04:00

Hi
I think your application has some problems:
The first one, you must read price from a table. because price will be change as soon as therefore you must design a form for change that and save that in a table or Xml data file.

The second one, you must implement a way for calculate total price. for this section I have two suggestion:

1- You can use from a Property as TotalPrice and store and read value.

C#

private double DessertPrice { get; set; }
private double EntreePrice { get; set; }
private double AppetizerPrice { get; set; }
private double TotalPrice { get; set; }

private void comboBox1_SelectedIndexChanged_1(object sender, EventArgs e)
{
    if (comboBox3.SelectedIndex == 0)
        DessertPrice = 3.00;
    else if (comboBox3.SelectedIndex == 1)
        DessertPrice = 2.00;
    else if (comboBox3.SelectedIndex == 2)
        DessertPrice = 2.50;
    else
        DessertPrice = 2.00;
}

private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
    if (comboBox2.SelectedIndex == 0)
        EntreePrice = 25.00;
    else if (comboBox2.SelectedIndex == 1)
        EntreePrice = 15.00;
    else if (comboBox2.SelectedIndex == 2)
        EntreePrice = 12.00;
    else
        EntreePrice = 20.00;
}

private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
    if (comboBox1.SelectedIndex == 0)
        AppetizerPrice = 3.00;
    else if (comboBox1.SelectedIndex == 1)
        AppetizerPrice = 5.00;
    else if (comboBox1.SelectedIndex == 2)
        AppetizerPrice = 3.00;
    else
        AppetizerPrice = 3.00;
}

private void button1_Click_1(object sender, EventArgs e)
{
    TotalPrice = DessertPrice + EntreePrice + AppetizerPrice;

    MessageBox.Show(string.Format("Your total is {0}.", TotalPrice));

    DessertPrice = 0;
    EntreePrice = 0;
    AppetizerPrice = 0;
    TotalPrice = 0;
}

2- You can use from a class for this problem. (I think it is best way)

C#

public class Price
{
    internal double DessertPrice { get; set; }
    internal double EntreePrice { get; set; }
    internal double AppetizerPrice { get; set; }
    internal double TotalPrice { get; set; }

    public Price()
    {
        DessertPrice = 0;
        EntreePrice = 0;
        AppetizerPrice = 0;
        TotalPrice = 0;
    }

    public double CalculateTotalPrice()
    {
        TotalPrice = DessertPrice + EntreePrice + AppetizerPrice;
    }
}

    Price price = new Price();

    private void comboBox1_SelectedIndexChanged_1(object sender, EventArgs e)
    {
        if (comboBox3.SelectedIndex == 0)
            price.DessertPrice = 3.00;
        else if (comboBox3.SelectedIndex == 1)
            price.DessertPrice = 2.00;
        else if (comboBox3.SelectedIndex == 2)
            price.DessertPrice = 2.50;
        else
            price.DessertPrice = 2.00;
    }

    private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (comboBox2.SelectedIndex == 0)
            price.EntreePrice = 25.00;
        else if (comboBox2.SelectedIndex == 1)
            price.EntreePrice = 15.00;
        else if (comboBox2.SelectedIndex == 2)
            price.EntreePrice = 12.00;
        else
            price.EntreePrice = 20.00;
    }

    private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (comboBox1.SelectedIndex == 0)
            price.AppetizerPrice = 3.00;
        else if (comboBox1.SelectedIndex == 1)
            price.AppetizerPrice = 5.00;
        else if (comboBox1.SelectedIndex == 2)
            price.AppetizerPrice = 3.00;
        else
            price.AppetizerPrice = 3.00;

    }

    private void button1_Click_1(object sender, EventArgs e)
    {
        MessageBox.Show(string.Format("Your total is {0}.", price.CalculateTotalPrice()));
    }

I hope it's helpful for you.