using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    private static Dictionary<string, string> dictionary = new Dictionary<string, string> {

        { "key1", "val1" },

        { "key2", "val2" },

        { "key3", "val3" }

    };

    public static void Main()

    {

        var vals = dictionary.Select(kv => kv.Key + " : " + kv.Value);

        Console.WriteLine(string.Join(Environment.NewLine, vals));

    }

}