using System;

public class Program

{

    public static void Main()

    {

        //var strval = "fhfh";

        string str = "Visa VIJAY";

        string fname = "sam";

        string Lname = "fodge";

        string Name = string.Concat(fname,Lname);//concat method

        //var strval = strval.Split(" ");

        //Console.WriteLine(strval[0].ToUpper());

        //Console.WriteLine(strval[1].ToUpper());

        Console.WriteLine("string before " + str);

        str = str.ToUpper(); 

        str = str.ToLower();

        Console.WriteLine( "length of string is " +str.Length);

        // string Interpolation -> using notations $

        Name = $" My Name is {fname} {Lname}";

        int age =100;

        string addr = "tamilnadu";

        string interpo = $" My name is {fname}. My address{addr}.My age is {age}";

    }

}