C#, pronounced C Sharp, is a relatively new programming language from
Microsoft that was designed to take full advantage of the new .Net
Framework.
You might want to check back from time to time if you find this information
usefull as I will be trying to update it semi-regularly.
A little info about what you're about to see. I created a function or
module called "CalculatePizzaOrder()"
which checks the status of the order form and all its elements and determines
what the price of the pizza order should be then displays it on the form.
At this stage of the design, this is the real core of the forms workings.
Later I'll use this CalculatePizzaOrder module to put together an order
message based on input from the form selections.
using System;
using
System.Collections.Generic;
using
System.ComponentModel;
using
System.Data;
using
System.Drawing;
using
System.Text;
using
System.Windows.Forms;
namespace Pizza_Guys
{
public partial class Form1 : Form
{
//Modesto
sales tax is 7.375
public const double dblTax =
7.375;
DateTime
CurrTime = DateTime.Now;
public
Form1()
{
InitializeComponent();
lblTaxPercentShow.Text =
dblTax.ToString() + "%";
lblOrderTimeDisplay.Text = String.Format("{0:g}",
CurrTime);
}
/*
* When the credit card
combo box changes check to see if cash,
* check or credit card is
selected. If cash or check is selected
* then disable credit card
#, card expiration date calendar control.
*/
private
void comboBoxCreditCard_SelectedIndexChanged(object sender, EventArgs
e)
{
string
strPaymentType = cBoxCreditCard.Text;
if
(strPaymentType == "Cash")
{
dateTimeCreditCardExpiration.Enabled = false;
txtCreditCardNumber.Enabled = false;
}
else
if (strPaymentType == "Check")
{
dateTimeCreditCardExpiration.Enabled = false;
txtCreditCardNumber.Enabled = false;
}
else
{
dateTimeCreditCardExpiration.Enabled = true;
txtCreditCardNumber.Enabled = true;
}
}
//btnExit_Click
closes the form when the user clicks on the btnExit Button.
private
void btnExit_Click(object
sender, EventArgs e)
{
Form1.ActiveForm.Close();
}
/*
* btnSubmit_Click displays
a message box that simply says Order Submitted.
* Later I'll add more code
to do something like connect to a database and
* add a record using the
information from the form fields.
*/
private
void btnSubmit_Click(object
sender, EventArgs e)
{
MessageBox.Show("Order Submitted");
}
private
void btnCalculate_Click(object sender, EventArgs e)
{
//Calculate
the order
CalculatePizzaOrder();
}
private
void CalculatePizzaOrder()
{
//Calculate
the order
double
dblPizzaPrice = 0.00;
if
(rbPizzaSmall.Checked)
{
dblPizzaPrice = 9.95;
}
if
(rbPizzaMedium.Checked)
{
dblPizzaPrice = 12.95;
}
if
(rbPizzaLarge.Checked)
{
dblPizzaPrice = 15.95;
}
if
(checkBoxToppingSausage.Checked)
{
dblPizzaPrice = dblPizzaPrice +
.50;
}
if
(checkBoxToppingPepperoni.Checked)
{
dblPizzaPrice = dblPizzaPrice +
.50;
}
if
(checkBoxToppingsOlives.Checked)
{
dblPizzaPrice = dblPizzaPrice +
.50;
}
if
(checkBoxToppingsAnchovies.Checked)
{
dblPizzaPrice = dblPizzaPrice +
.50;
}
if
(checkBoxToppingsOnions.Checked)
{
dblPizzaPrice = dblPizzaPrice +
.50;
}
if
(checkBoxToppingsExtraCheese.Checked)
{
dblPizzaPrice = dblPizzaPrice +
.50;
}
string
strQty;
strQty = txtQty.Text;
dblPizzaPrice = dblPizzaPrice * double.Parse(strQty);
string
PizzaPrice;
PizzaPrice =
dblPizzaPrice.ToString();
/* This
is the easiest way to format the string for currency using
*
String.Format("{0:c}", double.Parse(PizzaPrice));
* Double.Parse
(String) Converts the string
representation
* of a number to its
double-precision floating-point number equivalent.
*/
PizzaPrice = String.Format("{0:c}",
double.Parse(PizzaPrice));
lblDisplaySubTotal.Text =
PizzaPrice;
lblDisplayTax.Text = String.Format("{0:c}",
((dblTax * dblPizzaPrice) / 100));
double
dblPizzaTax = (dblTax * dblPizzaPrice) / 100;
double
dblPizzaTotal = dblPizzaPrice + dblPizzaTax;
/*
* set the
DisplayOrderTotal Text the value of dblPizzaTotal and
* format the string to
display as currency
* {0:c} formats string
to currency
*/
lblDisplayOrderTotal.Text = String.Format("{0:c}",
dblPizzaTotal);
}
private
void rbPizzaSmall_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void rbPizzaMedium_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void rbPizzaLarge_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void checkBoxToppingSausage_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void checkBoxToppingPepperoni_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void checkBoxToppingOlives_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void checkBoxToppingsAnchovies_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void checkBoxToppingsOnions_CheckedChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
private
void
checkBoxToppingsExtraCheese_CheckedChanged(object
sender, EventArgs e)
{
CalculatePizzaOrder();
}
private
void cBoxQty_SelectedIndexChanged(object sender, EventArgs
e)
{
CalculatePizzaOrder();
}
/*
* Added: 11/08/2006
* This CheckEmpty Module is
a work in progress so be careful if you decide to use it
* It kinda works but is
still is a little rough around the edges but the basic
* concept seems to work and
shows some promise for automating the basic validation
* of checking the textboxes
* It is supposed to check
any textbox that calls it and check to see if it is empty
* then tell the user they
need to enter something in the textbox
*/
private
void CheckEmpty(object
sender, EventArgs e)
{
/*
* get the info on what
object called the module and display an error message
* Some of the next
couple of lines I barrowed from
*
http://www.c-sharpcorner.com/1/win_frm1.asp
* Formate ToString
returns is like "Button, text: <value>" so
* retrieving value from
it.
*/
int
iIndex = sender.ToString().IndexOf(":");
String
sSub = sender.ToString().Substring(iIndex + 1).Trim();
if(sSub.Length
== 0)
MessageBox.Show("Is Empty");
}
private
void txtBoxName_LostFocus(object sender, EventArgs
e)
{
MessageBox.Show(e.ToString());
CheckEmpty(sender,e);
}
/*
* Added: 11/08/2006
* Replaced the drop down
quantity comboBox with a TextBox
* I did this to make my
code close to what was covered
* in our lecture at MJC on
10/07/2006
*
* Found this explanation of
Handled @
*
http://msdn2.microsoft.com/en-gb/library/system.windows.forms.keyeventargs.handled.aspx
*
* Definition from Microsoft
MSDN of Handled as it applys to a TextBox
*
* Handled is implemented
differently by different
* controls within Windows
Forms. For controls like
* TextBox which subclass
native Win32 controls,
* it is interpreted to mean
that the key message
* should not be passed to
the underlying native control.
*
* If you set Handled to
true on a TextBox, that control
* will not pass the key
press events to the underlying
* Win32 text box control,
but it will still display
* the characters that the
user typed.
*
* The next module uses
Handled with the value set to true
* if the keypress is
anything other than a number.
*/
private
void txtQty_KeyPress(object
sender, KeyPressEventArgs e)
{
if
(e.KeyChar < '0' || e.KeyChar > '9')
{
e.Handled = true;
}
}
/*
* Added: 11/08/2006
* Now that the qty in the
textbox is checked to make sure it is a
* number we can call the
CalculatePizzaOrder() Module to recalculate
* the price.
*/
private
void txtQty_TextChanged(object sender, EventArgs e)
{
CalculatePizzaOrder();
}
}
}
