using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var _settings = new List<KeyValuePair<string,string>> {

            new KeyValuePair<string,string>("K1","V1"),

            new KeyValuePair<string,string>("K2","V2"),

            new KeyValuePair<string,string>("K3","V3")

        };

        Console.WriteLine(ToDatabasePipeFormat(_settings));

    }

     public static string ToDatabasePipeFormat(IEnumerable<KeyValuePair<string,string>> _settings)

       {

           string pipeSettings = String.Empty;

           foreach (var setting in _settings)

           {

               pipeSettings += $"{setting.Key}|{setting.Value}{Environment.NewLine}";

           }

         return pipeSettings.TrimEnd();

     }

}