we will use c# to solve that

1. What is an Abstract class? What is the purpose of using an abstract class?

2. What is an Interface? What is the purpose of using an Interface?

3. Complete the code to count the total number of words in testString and store it in numberOfWords and display it:

static void Main(string[] args)

{

string testString = "This is a test string";

int numberOfVowels = 0;

//Your code as Answer

}