Answered Essay: Build a one-page application with the user interface that’s shown below. This time, the user will enter the sales price and discount percen


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Build a one-page application with the user interface that’s shown below. This time, the user will enter the sales price and discount percent, and the application will calculate and display the discount amount and total price. If a user entry is invalid, an error message will be displayed to the right of the related text box.

Start a new web site and build the form

Start a new web site named XEx02Quotation in your exercises_extra folder.

Add a web form to the project with the name Default.aspx.

Add an h1 heading to the form element with the text shown above.

Add a table to the form below the heading with 8 rows and 3 columns. (The third column will be used for validation controls.)

Add the text and button shown above to the cells in the first, third, fourth, sixth, and eighth rows of the first column.

Adjust the width of the table by dragging its right handle, and adjust the widths of the columns by dragging their right borders so the widths are similar to what’s shown above. (It may take some time to get this right, and the form may look different in Design view than it does when you run the application.)

Add text boxes to the first and third rows in the second column, and add label controls to the fourth and six rows in the second column.

Use the Properties window to set appropriate IDs for the controls and to format the first text box and the two labels with bold type. Then, use the Properties window to set the text for the button to “Calculate”.

Test this form to see how it looks in a browser, and make whatever adjustments are necessary.

Add the C# code for the form

Create an event handler for the click event of the Calculate button. This handler should calculate the discount amount and total price and display them in currency format as shown above.

Test this form to see whether it works correctly, and make whatever corrections are necessary.

Add validators for the text boxes

Add a required field validator in the column to the right of each text box that tests whether an entry has been made in the text box. If an entry hasn’t been made, “Required” should be displayed.

Add a range validator in the column to the right of each text box. The one for the Sales Price should test to see whether the entry is between 10 and 1000, and an appropriate message should be displayed if it isn’t. The one for the Discount Percent should test whether the entry is between 10 and 50, and an appropriate message should be displayed if it isn’t.

If necessary, adjust the C# code for the page so it only does the calculations if the entries are valid.

Turn off unobtrusive validation for the page. Then, test the application, and make whatever corrections are necessary.

Make any final adjustments

Take a final look at the application, and make any adjustments for improving the look of the application, the operation of the application, or the clarity and logic of the code.

Transfer the website to your Student Serve website WEB180Even.

Expert Answer


aspx code of the project:

<%@ Page Language=”C#” AutoEventWireup=”true” CodeBehind=”Default.aspx.cs” Inherits=”XEx02.Default” %>

<!DOCTYPE html>

<html >
<head runat=”server”>
<style type=”text/css”>
.auto-style1 {
width: 56%;
.auto-style3 {
width: 186px;
.auto-style5 {
width: 152px;
.auto-style6 {
width: 140px;
<form id=”form1″ runat=”server”>
<h1>Price Quotation</h1>
<table class=”auto-style1″>
<td class=”auto-style5″>Sales Price</td>
<td class=”auto-style6″>
<asp:TextBox ID=”salesPrice” runat=”server”></asp:TextBox>

<asp:RangeValidator ID=”RangeValidator1″ runat=”server” ErrorMessage=”10 to 1000 range” MaximumValue=”1000″ MinimumValue=”10″ Type=”Integer” ControlToValidate=”salesPrice”></asp:RangeValidator>

<td class=”auto-style3″>

<asp:RequiredFieldValidator ID=”RequiredFieldValidator1″ runat=”server” ErrorMessage=”*Sales Price Required” ControlToValidate=”salesPrice”>



<td class=”auto-style5″>Discount Percent</td>
<td class=”auto-style6″>
<asp:TextBox ID=”discountPercent” runat=”server”></asp:TextBox>

<asp:RangeValidator ID=”RangeValidator2″ runat=”server” ErrorMessage=”10 to 50 range” MaximumValue=”50″ MinimumValue=”10″ Type=”Integer” ControlToValidate=”discountPercent”></asp:RangeValidator>

<td class=”auto-style3″>

<asp:RequiredFieldValidator ID=”RequiredFieldValidator2″ runat=”server” ErrorMessage=”*Discount Price Required” ControlToValidate=”discountPercent”>



<td class=”auto-style5″>Discount Amount</td>
<td class=”auto-style6″>
<asp:Label ID=”doller” runat=”server” Text=”$” Font-Bold=”True”></asp:Label>
<asp:Label ID=”discountAmount” runat=”server” Font-Bold=”True”></asp:Label>
<td class=”auto-style3″>


<td class=”auto-style5″>Total Price</td>
<td class=”auto-style6″>
<asp:Label ID=”doller1″ runat=”server” Text=”$” Font-Bold=”True”></asp:Label>
<asp:Label ID=”totalPrice” runat=”server” Font-Bold=”True”></asp:Label>
<td class=”auto-style3″>


<asp:Button ID=”Button1″ runat=”server” Text=”Calculate” Width=”100px” OnClick=”Button1_Click” />

C# code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace XEx02
public partial class Default : System.Web.UI.Page
protected void Page_Load(object sender, EventArgs e)
doller.Visible = false;
doller1.Visible = false;


protected void Button1_Click(object sender, EventArgs e)
doller.Visible = true;
doller1.Visible = true;

double discount=0, total=0;

discount = double.Parse(salesPrice.Text) * double.Parse(discountPercent.Text)/100;

total = double.Parse(salesPrice.Text) – discount;

discountAmount.Text = discount.ToString(“0.00”);
totalPrice.Text = total.ToString(“0.00”);



20 percent of 500 is 100 so calculated like that.

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