Concatenate string with integers : String Concat « String « C# / CSharp Tutorial

using System;  

class MainClass {  
  public static void Main() {  
  
    string result = String.Concat("The value is " + 19); 
    Console.WriteLine("result: " + result);  
 
  }  
}

result: The value is 19

5.8.String Concat
	5.8.1.	Append strings using Concat()
	5.8.2.	Concatenate string with integers
	5.8.3.	Mix string and integer in string cancatenation
	5.8.4.	Concatenate string with non-strings
	5.8.5.	String concatenation
	5.8.6.	Concat method with a String array.