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The dates used and the way they display are based on the Regional Settings of the Control Panel. It may also depend on the operating system.
This convenient control is called month calendar or simply calendar. The title bar of the control displays two buttons and two labels. The left button allows the user to select the previous month by clicking the button. The left label displays the currently selected month. The right label displays the year of the displayed date. The right button is used to get to the next month.
The calendar can be configured to display more than one month. Here is an example that displays two months:
If the control is displaying more than one month, the buttons would increment or decrement by the previous or next month in the list. For example, if the control is displaying April and
May and if the user clicks the left button, the control would display March and April. If the control is displaying April and May and the user clicks the right button, the control would display May and June. Also, to select any month of the current year, the user can click the name of the month, which displays the list of months and
this allows the user to click the desired month:
To select a year, the user can click the year number. This changes the year label into a spin button:
To change the year, the user can click the up or down arrows of the spin button. As the spin button is displaying, the user can also use the arrow keys of the keyboard to increase or decrease the value.
Under the title bar, the short names of week days display, using the format set in Control Panel. In US English, the first day is usually Sunday. The first day can be changed by the programmer.
On the control, the currently selected date has a circle around. To select a date on the control, the user clicks the desired date, which changes from the previous selection.
In the main area, the numeric days of the month display on a white background (this color and any color on the control can be changed as we will see in the next section). To select a date, the user clicks it in the list. By default, the calendar opens with today's day circled with a hand-drawn-look-alike ellipse. Using the buttons of the title bar, the month label, and/or the year, the user can change the date. If at one time the calendar is displaying a date other than today, and if the user wants to return to today's date, he
or she can click the bottom label that displays Today (you as the programmer can hide the Today label if you want).
To create a calendar control, you can click the
MonthCalendar button 
in the Toolbox and click the form or the desired container. The MonthCalendar
control is based on the MonthCalendar class, which is based on Control.
Therefore, to create a calendar control, declare a variable or type MonthCalendar
and initialize it appropriately.
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 Practical
Learning: Introducing the Month Calendar Control
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- Start a new Windows Application named PayrollProcessing2
- In the Solution Explorer, right-click Form1.cs and click Rename
- Type PayrollProcessing.cs and press Enter
- Design the form as follows:
- On the form, double-click the Calculate button 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");
}
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- Save the form
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