Example Application: Payroll Evaluation

	Example Application: Payroll Evaluation

Description

This application evaluates payroll, using the total time worked in one or two weeks by an employee and his or her hourly salary. The calculation takes overtime into account.

Application: Creating the Application

To start a new application, on the main menu, click File -> New Project (or File -> New Project)
In the middle list, click Windows Application and set the name to PayrollProcessing1
Click OK

Design the form as follows:

Control	Name	Text	Other Properties
GroupBox		Employee Identification
Label		&Employee Name:
TextBox	txtEmployeeName
Label		Hourly &Salary:
TextBox	txtHourlySalary
GroupBox		Time Values
Label		Monday
Label		Tuesday
Label		Wednesday
Label		Thursday
Label		Friday
Label		Saturday
Label		Sunday
Label		First Week:
TextBox	txtMonday1	0.00	TextAlign: Right
TextBox	txtTuesday1	0.00	TextAlign: Right
TextBox	txtWednesday1	0.00	TextAlign: Right
TextBox	txtThursday1	0.00	TextAlign: Right
TextBox	txtFriday1	0.00	TextAlign: Right
TextBox	txtSaturday1	0.00	TextAlign: Right
TextBox	txtSunday1	0.00	TextAlign: Right
Label		Second Week:
TextBox	txtMonday2	0.00	TextAlign: Right
TextBox	txtTuesday2	0.00	TextAlign: Right
TextBox	txtWednesday2	0.00	TextAlign: Right
TextBox	txtThursday2	0.00	TextAlign: Right
TextBox	txtFriday2	0.00	TextAlign: Right
TextBox	txtSaturday2	0.00	TextAlign: Right
TextBox	txtSunday2	0.00	TextAlign: Right
GroupBox		Payroll Processing
Label		Hours
Label		Amount
Label	btnCalculate	Calculate	AutoSize: False
Label		Regular
TextBox	txtRegularTime	0.00	TextAlign: Right
TextBox	txtRegularAmount	0.00	TextAlign: Right
Label		Net Pay:
TextBox	txtNetPay	0.00	TextAlign: Right
Label		Overtime
TextBox	txtOvertime	0.00	TextAlign: Right
TextBox	txtOvertimeAmount	0.00	TextAlign: Right
Label	btnClose		AutoSize: False

On the form, click the text box at the intersection of Time and Regular
In the Properties window, double-click ReadOnly to change its value to True
Do the same for the following text boxes: txtRegularAmount, txtNetPay, txtOvertime, and txtOvertimeAmount
Double-click the Close label and implement its Click event as follows:
```
private void btnClose_Click(object sender, EventArgs e)
{
    Close();
}
```

Return to the form
On the form, click the txtEmployeeName text box
In the Properties window, click AutoCompleteCustomSource and click its ellipsis button
In the String Collection Editor, enter the following names:
Micheline Hammond
Paul Bertrand Yamaguchi
Gertrude Monay
Ernestine Ngaleu
Andy Barang
Christophe Yuen
Jean Michel Kankan
Click OK
Click AutoCompleteSource, then click the arrow of its combo box and select CustomSource
Click AutoCompleteMode, then click the arrow of its combo box and select Accept

On the form, double-click the Calculate label and implement its event as follows:

private void btnCalculate_Click(object sender, EventArgs e)
{
        double monday1 = 0.00, tuesday1 = 0.00, wednesday1 = 0.00,
                    thursday1 = 0.00, friday1 = 0.00, saturday1 = 0.00,
                    sunday1 = 0.00, monday2 = 0.00, tuesday2 = 0.00,
                    wednesday2 = 0.00, thursday2 = 0.00,
         friday2 = 0.00, saturday2 = 0.00, sunday2 = 0.00;
         double totalHoursWeek1, totalHoursWeek2;

         double regHours1 = 0.00, regHours2 = 0.00,
                     ovtHours1 = 0.00, ovtHours2 = 0.00;
         double regAmount1 = 0.00, regAmount2 = 0.00,
                     ovtAmount1 = 0.00, ovtAmount2 = 0.00;
         double regularHours, overtimeHours;
         double regularAmount, overtimeAmount, totalEarnings;

         double hourlySalary = 0.00;

         // Retrieve the hourly salary
         try
         {
                hourlySalary = double.Parse(txtHourlySalary.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show(
                    "The value you typed for the salary is invalid \n" +
                    "Please try again");
                txtHourlySalary.Focus();
         }

         // Retrieve the value of each day worked
         try
         {
                monday1 = double.Parse(txtMonday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                         "Please try again");
                txtMonday1.Focus();
         }
         try
         {
                tuesday1 = double.Parse(txtTuesday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                this.txtTuesday1.Focus();
         }
         try
         {
                wednesday1 = double.Parse(txtWednesday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtWednesday1.Focus();
         }
         try
         {
                thursday1 = double.Parse(txtThursday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtThursday1.Focus();
         }

         try
         {
                friday1 = double.Parse(txtFriday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtFriday1.Focus();
         }

         try
         {
                saturday1 = double.Parse(txtSaturday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtSaturday1.Focus();
         }

         try
         {
                sunday1 = double.Parse(txtSunday1.Text);
         }
         catch (FormatException)
         {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtSunday1.Focus();
            }
            try
            {
                monday2 = double.Parse(txtMonday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                this.txtMonday2.Focus();
            }
            try
            {
                tuesday2 = double.Parse(txtTuesday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                this.txtTuesday2.Focus();
            }
            try
            {
                wednesday2 = double.Parse(txtWednesday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                this.txtWednesday2.Focus();
            }
            try
            {
                thursday2 = double.Parse(txtThursday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtThursday2.Focus();
            }
            try
            {
                friday2 = double.Parse(txtFriday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtFriday2.Focus();
            }
            try
            {
                saturday2 = double.Parse(txtSaturday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtSaturday2.Focus();
            }
            try
            {
                sunday2 = double.Parse(txtSunday2.Text);
            }
            catch (FormatException)
            {
                MessageBox.Show("You typed an invalid value\n" +
                    "Please try again");
                txtSunday2.Focus();
            }

            // Calculate the total number of hours for each week
            totalHoursWeek1 = monday1 + tuesday1 + wednesday1 +
                  thursday1 + friday1 + saturday1 + sunday1;
            totalHoursWeek2 = monday2 + tuesday2 + wednesday2 +
                thursday2 + friday2 + saturday2 + sunday2;

            // The overtime is paid time and half
            double ovtSalary = hourlySalary * 1.5;

            // If the employee worked under 40 hours, there is no overtime
            if (totalHoursWeek1 < 40)
            {
                regHours1 = totalHoursWeek1;
                regAmount1 = hourlySalary * regHours1;
                ovtHours1 = 0.00;
                ovtAmount1 = 0.00;
            } // If the employee worked over 40 hours, calculate the overtime
            else if (totalHoursWeek1 >= 40)
            {
                regHours1 = 40;
                regAmount1 = hourlySalary * 40;
                ovtHours1 = totalHoursWeek1 - 40;
                ovtAmount1 = ovtHours1 * ovtSalary;
            }

            if (totalHoursWeek2 < 40)
            {
                regHours2 = totalHoursWeek2;
                regAmount2 = hourlySalary * regHours2;
                ovtHours2 = 0.00;
                ovtAmount2 = 0.00;
            }
            else if (totalHoursWeek2 >= 40)
            {
                regHours2 = 40;
                regAmount2 = hourlySalary * 40;
                ovtHours2 = totalHoursWeek2 - 40;
                ovtAmount2 = ovtHours2 * ovtSalary;
            }

            regularHours = regHours1 + regHours2;
            overtimeHours = ovtHours1 + ovtHours2;
            regularAmount = regAmount1 + regAmount2;
            overtimeAmount = ovtAmount1 + ovtAmount2;
            totalEarnings = regularAmount + overtimeAmount;

            txtRegularTime.Text = regularHours.ToString("F");
            txtOvertime.Text = overtimeHours.ToString("F");
            txtRegularAmount.Text = regularAmount.ToString("F");
            txtOvertimeAmount.Text = overtimeAmount.ToString("F");

            txtNetPay.Text = totalEarnings.ToString("F");
        }

Execute the application to see the result
Close the form and return to your programming environment


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