Using murach's c#Use an array to store invoice totals

Declare two class variables: $(1)$ an array that can hold up to five invoice totals

and $(2)$ an index that you can use to work with that array.

Add code that adds the invoice total to the next element in the array each time

the user clicks the Calculate button.

Add code that displays all the invoice totals in the array in a message box

when the user clicks the Exit button. To do that, use a foreach loop to loop

through the totals and format the message for the message box. Within this

loop, you should include an if statement so you only display totals that are not

equal to zero.

Test the program by entering subtotals for up to five invoices and then

clicking the Exit button. This should display a dialog box like this one:

Test the program by entering more than five invoices. When you do$,$ an

IndexOutOfRangeException should be thrown. Then, modify the try$-$catch

statement so it handles this exception.

Sort the invoice totals

Add code to sort the invoice totals in the array.

Test the program again to be sure that the message box displays the invoice

totals in the correct sequence.

Modify the program so it uses a list

Without changing any of the current code, repeat steps $2$ through $8$ but use a

list to hold the totals and add a second foreach loop to format and display the

totals stored in the list in a second message box. In other words, display two

message boxes: one for the array and one for the list.

When you've got this working right, close the solution.