Finding the key by its value

FindingKeyByItsValue.cs

using System;
using System.Linq;
using System.Collections.Generic;

class Program
{
    public static void Main(string[] args)
    {
        var dict = new Dictionary<string, int>();
        dict.Add("A", 25);
        dict.Add("B", 35);
        dict.Add("C", 45);

        var key = dict.Single(kv => kv.Value == 35).Key;
        Console.WriteLine(key);
        Console.ReadKey();
    }
}