Nifty Repair Service needs an app the calculates a service call charge. The app will have the user enter a name, hours worked and parts costs. It will then calculate the total charge. The service charge rate is $$120\mathrm{.}00$ per hour, but the minimum hours charge for a service call is $$200\mathrm{.}00.$ Hours can be entered with decimal $(1\mathrm{.}5).$ A $7\%$ tax is added to the parts cost.

Create a GUI interface with needed controls. Validate the data entered. Use String Interpolation to display output in a multiline text box. Use the C# naming conventions for data identifiers and controls $($meaningful name with appropriate prefix for instance$-$txtName$).$