CS_0017_String_Format

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace string1

{

    class Program

    {

        static void Main(string[] args)

        {

            string myString1 = string.Format("{0}!", "MATHI"); // Assign the First Value String

            string myString2 = string.Format("Make: {0} Model: {1}", "MARUTI", "RITZ");

            string myString3 = string.Format("{0:C}", 12345); // Currency

            string myString4 = string.Format("{0:N}", 1234567890); // Number

            string myString5 = string.Format("{0:P}", 0.123); // Percentage

            string myString6 = string.Format("Phone: {0:(###) ### - ####}", 1234567890); // Phone Number

            Console.WriteLine(myString1);

            Console.WriteLine(myString2);

            Console.WriteLine(myString3);

            Console.WriteLine(myString4);

            Console.WriteLine(myString5);

            Console.WriteLine(myString6);

  

            Console.ReadLine();

           

            // RESULTS

            //MATHI!

            //Make: MARUTI Model: RITZ

            //$12,345.00

            //1,234,567,890.00

            //12.30 %

            //Phone: (123) 456 - 7890

https://docs.microsoft.com/en-us/dotnet/api/system.string.format?view=netframework-4.7.2