using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        string temp = "https://outlook.office.com/CompliancePolicy/api/v1.0/user/PolicyContainer?$Purpose={0}&$CacheMailboxType=User&$CacheMailboxIdentity=OID:{1}@{2}&$PolicyLocation={{\"AadIdentity\":[\"{1}\"]}}";

        Console.WriteLine(temp);

        var temp2 = string.Format(temp, "zero", "one", "two");

        Console.WriteLine(temp2);

        var objectB = new B();

        var objectA = new A();

        objectB.TestMethod();

        objectA.TestMethod();

    }

}

​

public class A

{

    public void TestMethod()

    {

        Console.WriteLine("Test Method of A");

    }

}

​

public class B: A

{

    public void TestMethod()

    {

        Console.WriteLine("Test Method of B");

    }

}