/*
* Function name: ClearButton_Click
* Author: Michael Fesser
* Version: # 1.0, Sept 20, 2014
* Description: This function clears the form fields.
* Inputs: None.
* Outputs: None.
* Return value: None.
* Change History: 2014.09.20 Original version by MF
*/
private void ClearButton_Click(object sender, EventArgs e)
{
// Clear the form.
TotalShippingCostTextBox.Clear();
NumberOfItemsTextBox.Clear();
NumberOfItemsTextBox.Focus();
}
/*
* Function name: CalculateButton_Click
* Author: Michael Fesser
* Version: # 1.0, Sept 20, 2014
* Description: This function will on the button click do all the calculations
* needed to calculate the shipping charges.
* Inputs: Parameters - numberOfItems
* Outputs: UI - Error reports. Total shipping costs.
* Return value: None.
* Change History: 2014.09.20 Original version by MF
*/
private void CalculateButton_Click(object sender, EventArgs e)
{
int numberOfItems;
decimal totalPrice = 0.00m;
// The following variables are used to remove the numberOfItems for each category of shipping charges from the total
// number of items.
int lessOneItem = 1;
int lessFiveItems = 5;
int lessFourteenItems = 14;
// The following variables are used to help calculate the max shipping costs for each category of shipping charges.
int itemsTwoToFive = 4;
int itemsSixToFourteen = 9;
// Used to display error messages to the user.
string messageString;
try
{
// Get the number of items from the user and parse it to an int.
numberOfItems = int.Parse(NumberOfItemsTextBox.Text);
/* This set of conditional statements will calculate the total price of the shipping charges.
* This is done by finding the number of items in a category, multiplying by the shipping
* charges in that category and adding any shipping charges that would have accumulate from any previous
* shipping categories.
*
*/
if (numberOfItems == 1)
{
totalPrice = firstItemShipping;
}
// Two to five items.
else if (numberOfItems >= 2 && numberOfItems <= 5)
{
totalPrice = (numberOfItems - lessOneItem) * twoToFiveItemsShipping + firstItemShipping;
}
// Six to fourteen items.
else if (numberOfItems >= 6 && numberOfItems <= 14)
{
totalPrice = (numberOfItems - lessFiveItems) * sixToFourteenItemsShipping + (itemsTwoToFive * twoToFiveItemsShipping)
+ firstItemShipping;
}
// More then fifteen items.
else if (numberOfItems >= 15)
{
totalPrice = (numberOfItems - lessFourteenItems) * fifteenPlusItemsShipping + (itemsSixToFourteen * sixToFourteenItemsShipping)
+ (itemsTwoToFive * twoToFiveItemsShipping) + firstItemShipping;
}
// Display the shipping costs.
TotalShippingCostTextBox.Text = totalPrice.ToString("C");
}
catch (FormatException)
{
// Handle a number format exception.
MessageBox.Show("Number of items must be numeric.",
"Data Entry Error", MessageBoxButtons.OK,
MessageBoxIcon.Information);
NumberOfItemsTextBox.Clear();
NumberOfItemsTextBox.Focus();
}
catch (Exception theException)
{
// Handle all other exceptions.
messageString = "Error: " + theException.Message;
MessageBox.Show(messageString, "Error", MessageBoxButtons.OK,
MessageBoxIcon.Warning);
NumberOfItemsTextBox.Clear();
}
}