these are c# questions

Question 13 Question 19 Forms applications differ from console based applications in that they aredriven and must be Specifying afor a parameter allows you to make the parameter optional built to respond to users Question 20 Question 14 When reading from text based files, all of the content is treated as All interface methods are public and Question 15 by default 2 p! Question 21 An base class allows you to define a function without an implementation, forcing child classes What is the difference between an abstract class and an interface? w to implement the method Question 24 Question 16 What is the main job of a Canstructor methad in a class methods can only be called from instances of the class Question 17 A class must implement the Question 18 interface if it is to be used in a foreach loop 2 The interface is used when objects need to be compared to determine if they are less than