Question

In C#

Customer is a static class, and Buy() is a static method of the class Customer. To call the method Buy(), I should write:

Answer 1

Answer::

I am explaining the question with help of small program which will help you to understand.And also I have added information related to it as comments in program.

using System;
//static class Customer
public static class Customer
{
  //static method Buy()
  public static void Buy()
  {
    Console.WriteLine("Buy() method called"); //some statements
  }
}
class MainClass {
  public static void Main (string[] args) {
    //Here we are calling our static Buy() method of static class Customer 
    //In C#, static means something which cannot be instantiated. You cannot create an object of a static class and cannot access static members using an object.
    //you can user Class name while calling a method of that class.
    Customer.Buy();  
   
  }
}

Output::

  

Use the above as reference.If any problem comment.