CSharp - String String concatenation

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Introduction

The + operator concatenates two strings: 

string s = "a" + "b";

If One of the operands is not a string value, ToString is called on that value. For example: 

string s = "a" + 5;  // a5

Demo

using System;
class MainClass/*from   ww w .j a v a 2  s  .  c o m*/
{
   public static void Main(string[] args)
   {
       string s = "a" + 5;  // a5
       Console.WriteLine(s);

   }
}

Result

Exercise