using System;

public class Program

{

​

  public static void Main()

  {

      Console.WriteLine("=> String concatenation:");

      string si = "Programming the ";

      string s2 = "PsychoDrill (PTP)"; 

      string s3 = si + s2;

      Console.WriteLine (s3);

      Console.WriteLine ();

      Console.WriteLine("=> String concatenation:"); 

      string s1 = "Programming the "; 

      string s4 = "PsychoDrill (PTP)";

      string s5 = String.Concat (s1, s4);

      Console.WriteLine (s5);

      Console.WriteLine();

  }

  }

​

​