Question

Write a C# code for a Sales Calculator:

Note: You cannot use the foreach loop in any part of this program!

sales.txt file: 1189.55, 1207.00, 1348.27, 1456.88, 1198.34, 1128.55, 1172.37, 1498.55, 1163.29

The application should have controls described as follows:

• A button that reads Get Sales. If the user clicks this button, the application should call a method named ProcesSalesFile. ProcessSalesFile Method: accepts no arguments and does not return anything The ProcessSalesFile Method will do the following: o Open the Sales.txt file o Read its contents into an array o Close the Sales.txt file o Displays the array’s contents in a list box control. o Calculate and display the total of the array’s values in an output label o Display an error message if the file cannot be opened o Variables must have appropriate data type and meaningful names o Exception handling must be included in this program: Use the try-catch

• A button that reads Clear. If the user clicks this button, the application should clear the list box and output label

• A button that reads Exit. If the user clicks this button, the application should close the program.

• A list box to display each sales value (one value per line) formatted to 2 decimal places.
• An output label that will display the total of the array’s values formatted to 2 decimal places.

• Additional label controls as needed for user prompts and information

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here a new Windows Forms Application in C# is created using Visual Studio 2017 with name "SalesCalculator".This application contains a form with name "Form1.cs".Below are the files associated with form1.

1.Form1.cs[Design]

2.Form1.Designer.cs

namespace SalesCalculator
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;

/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}

#region Windows Form Designer generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.btnGetSales = new System.Windows.Forms.Button();
this.btnClear = new System.Windows.Forms.Button();
this.lstSales = new System.Windows.Forms.ListBox();
this.lbltotal = new System.Windows.Forms.Label();
this.btnExit = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// btnGetSales
//
this.btnGetSales.Location = new System.Drawing.Point(80, 23);
this.btnGetSales.Name = "btnGetSales";
this.btnGetSales.Size = new System.Drawing.Size(115, 33);
this.btnGetSales.TabIndex = 0;
this.btnGetSales.Text = "Get Sales";
this.btnGetSales.UseVisualStyleBackColor = true;
this.btnGetSales.Click += new System.EventHandler(this.btnGetSales_Click);
//
// btnClear
//
this.btnClear.Location = new System.Drawing.Point(102, 279);
this.btnClear.Name = "btnClear";
this.btnClear.Size = new System.Drawing.Size(93, 34);
this.btnClear.TabIndex = 1;
this.btnClear.Text = "&Clear";
this.btnClear.UseVisualStyleBackColor = true;
this.btnClear.Click += new System.EventHandler(this.btnClear_Click);
//
// lstSales
//
this.lstSales.FormattingEnabled = true;
this.lstSales.Location = new System.Drawing.Point(12, 77);
this.lstSales.Name = "lstSales";
this.lstSales.Size = new System.Drawing.Size(120, 173);
this.lstSales.TabIndex = 2;
//
// lbltotal
//
this.lbltotal.AutoSize = true;
this.lbltotal.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.lbltotal.Location = new System.Drawing.Point(170, 137);
this.lbltotal.Name = "lbltotal";
this.lbltotal.Size = new System.Drawing.Size(0, 20);
this.lbltotal.TabIndex = 3;
//
// btnExit
//
this.btnExit.Location = new System.Drawing.Point(214, 279);
this.btnExit.Name = "btnExit";
this.btnExit.Size = new System.Drawing.Size(70, 34);
this.btnExit.TabIndex = 4;
this.btnExit.Text = "E&xit";
this.btnExit.UseVisualStyleBackColor = true;
this.btnExit.Click += new System.EventHandler(this.btnExit_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(296, 325);
this.Controls.Add(this.btnExit);
this.Controls.Add(this.lbltotal);
this.Controls.Add(this.lstSales);
this.Controls.Add(this.btnClear);
this.Controls.Add(this.btnGetSales);
this.Name = "Form1";
this.Text = "Sales Calculator";
this.ResumeLayout(false);
this.PerformLayout();

}

#endregion

private System.Windows.Forms.Button btnGetSales;
private System.Windows.Forms.Button btnClear;
private System.Windows.Forms.ListBox lstSales;
private System.Windows.Forms.Label lbltotal;
private System.Windows.Forms.Button btnExit;
}
}

3.Form1.cs

//namespace
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;
using System.IO;
//application namespace
namespace SalesCalculator
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//Sales button click
private void btnGetSales_Click(object sender, EventArgs e)
{
//try catch block
try
{
//calling method procee file
ProcesSalesFile();
}
//catch exception
catch (Exception ex)
{ //disply exception if any
MessageBox.Show(ex.Message);
}
}
//method to read the file
public void ProcesSalesFile()
{
//declaring array
decimal[] salesArray = new decimal[9];
//declaring variable
string line = "";
int i = 0;
decimal total =0;
//creating object of StramReader class
StreamReader streamReader = new StreamReader("sales.txt");
//while is used to read each line from the file
while((line=streamReader.ReadLine())!=null)
{
//add the line from the file into listbox
lstSales.Items.Add(line);
//parsing each line and add it into the array
salesArray[i] = decimal.Parse(line);
//calculating total of each sales item
total = total + salesArray[i];
//increment value of i
i++;
}
//display total on the lable
lbltotal.Text = total.ToString("0.00");
streamReader.Close();//close the file

}
//clear button click
private void btnClear_Click(object sender, EventArgs e)
{
//clear listbox and output label
lbltotal.Text = "";
lstSales.Items.Clear();
}
//Exit button click
private void btnExit_Click(object sender, EventArgs e)
{
this.Close();//close application
}
}
}

======================================================

Output : Run application using F5 and will get the screen as shown below

Screen 1 :

Screen 2 :Click on button to get sales total

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.