Extension methods for handling special cases C# with Example

Extension methods can be used to "hide" processing of inelegant business rules that would otherwise require 
cluttering up a calling function with if/then statements. This is similar to and analogous to handling nulls with 
extension methods. For example, 
public static class CakeExtensions 
{ 
public static Cake EnsureTrueCake(this Cake cake) 
{ 
//If the cake is a lie, substitute a cake from grandma, whose cakes aren't as tasty but are 
 

known never to be lies. If the cake isn't a lie, don't do anything and return it. 
return CakeVerificationService.IsCakeLie(cake) ? GrandmasKitchen.Get1950sCake() : cake; 
} 
} 
Cake myCake = Bakery.GetNextCake().EnsureTrueCake(); 
myMouth.Eat(myCake);//Eat the cake, confident that it is not a lie.