using System; class ClassifiedAd $\{//$ Properties public string Category $\{$ get; set; $\}$ public int Words $\{$ get; set; $\}$ public double Price $\{$ get; set; $\}//$ Constructor public ClassifiedAd$($string category, int words$)\{$ Category $=$ category; Words $=$ words; $//$ Call the method to calculate and set the initial price CalPrice$()$; $\}//$ Method to calculate and set the ad price public void CalPrice$()\{//$ Calculate the price based on the number of words and category if $($Category $==$ "Painting"$)\{$ Price $=$ Words $*0\mathrm{.}09$; $\}$ else if $($Category $==$ "Moving"$)\{$ Price $=$ Words $*0\mathrm{.}09+5\mathrm{.}00$; $\}$ else $\{//$ Default price if the category is not recognized Price $=$ Words $*0\mathrm{.}08$; $\}\}\}$ class AdApp$3\{$ static void Main$()\{//$ Create instances of ClassifiedAd ClassifiedAd ad$1=$ new ClassifiedAd$("$Painting$",120)$; ClassifiedAd ad$2=$ new ClassifiedAd$("$Moving$",150)$; $//$ Display information about the first advertisement Console.WriteLine$($$"What is the category of the first advertisement? $\{$ad$1.$Category$\}")$; Console.WriteLine$($$"How many words does it have? $\{$ad$1.$Words$\}")$; $//$ Display information about the second advertisement Console.WriteLine$($$"What is the category of the second advertisement? $\{$ad$2.$Category$\}")$; Console.WriteLine$($$"How many words does it have? $\{$ad$2.$Words$\}")$; $//$ Display the calculated prices Console.WriteLine$($$"The classified ad with $\{$ad$1.$Words$\}$ words in category $\{$ad$1.$Category$\}$ costs $$\{$ad$1.$Price.ToString$("$F$2")\}")$; Console.WriteLine$($$"The classified ad with $\{$ad$2.$Words$\}$ words in category $\{$ad$2.$Category$\}$ costs $$\{$ad$2.$Price.ToString$("$F$2")\}")$; $//$ Wait for user input before closing the console window Console.WriteLine$("$Press any key to continue"$)$; Console.ReadKey$()$; $\}\}$