Help Desk Assignment $1$

This assignment develops software to support the services provided by the IT help desk in an

organization. The help desk provides over$-$the$-$phone and on$-$site assistance with technical problems to

employees from different departments at multiple locations. The department of the employee who

requested the service is charged for the service.

The charge for service consists of a fixed charge and a variable charge. The fixed charge is $$10,$ and the

variable charge is the product of duration of service in minutes and charge$/$minute$.$ The charge$/$minute

varies with the area in which the service is provided, as specified later. The help desk would like to

develop a system that maintains information on support provided to employees. The system should do the

following:

Let the user enter the department code for the employee, the start time and end time of the service

$($if the study of Chapter $2$ was postponed to a later time, you may enter the number of minutes

instead of the start time and end time$),$ the fixed charge and the area of support.

Compute and display the duration of service in minutes, charge$/$minute and total charge for the

service.

The following are additional requirements of the input data and the computation and display of results:

The department code consists of an alphabetical letter that represents the location, followed by

two numeric digits that represent the department, as in $G03.$

The duration of service $=$ End time $-$ Start time.

Assume that each service ends the same day it is started.

The valid entries for area of service are:

computer system $($includes computer, printer, network, database and some applications$),$

ERP, BI and cloud.

The charge per minute is:

computer system: $$\frac{1\mathrm{.}00}{m}in$; ERP: $$\frac{1\mathrm{.}25}{m}in$; BI: $$\frac{1\mathrm{.}5}{m}in$; cloud: $$\frac{1\mathrm{.}25}{m}in$

Total charge $=$ fixed charge duration of service in minutes $$ charge $\frac{?}{\text{m}\text{i}\text{n}}$

Use a ListBox to display results. The decimals of dollar amounts displayed in the ListBox must

be aligned, even when they are of different sizes.

Validate data as follows:

The start time cannot be later than the end time.

Make sure that a valid number is entered in the fixed charge field. If the fixed charge is not a

valid number, do not let the user move away from the Textbox where the number is entered. Use

an Error Provider to display an appropriate message, and let the user type over.

Make sure that the first character of the department code entered by the user is an $"$A$,""$F$,""$G$"$

or $"$N$."$

Use Try Catch to catch other errors.

Other general requirements are:

Use efficient code that is easy to understand.

You must use meaningful and self$-$explanatory names for all variables and objects like forms,

TextBoxes, and so on$,$ using the naming conventions followed in the textbook. Don't use variable

names like tc $($for total charge$).$ You don't have to name Labels that are not used in the code.

Create a project named HDassignment$1,$ and develop a form named Helpdesk that meets the requirements

specified above.