C#: Configurations

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PrototypesCSharp
{
 class Configurations
 {
  public static string environment = "DEV"; // DEV, UAT, PRODUCTION

  public static Dictionary<string, string> DSNs()
  {

   var dsns = new Dictionary<string, string>();

   switch (Configurations.environment)
   {

    case "DEV":
     {
      dsns["dns1"] = "Server=127.0.0.1;Database=prototype_DEV;User Id=pitt;Password=phunsanit";
      dsns["dns1_replicate"] = "Server=127.0.0.1;Database=prototype_DEV;User Id=pitt;Password=phunsanit";
      dsns["dns2"] = "Server=127.0.0.1;Database=prototype_DEV;User Id=pitt;Password=phunsanit";
      dsns["dns2_replicate"] = "Server=127.0.0.1;Database=prototype_DEV;User Id=pitt;Password=phunsanit";
     }
     break;

    case "PRODUCTION":
     {
      dsns["dns1"] = "Server=127.0.0.1;Database=prototype;User Id=pitt;Password=phunsanit;";
      dsns["dns1_replicate"] = "Server=127.0.0.1;Database=prototype;User Id=pitt;Password=phunsanit;";
      dsns["dns2"] = "Server=127.0.0.1;Database=prototype;User Id=pitt;Password=phunsanit;";
      dsns["dns2_replicate"] = "Server=127.0.0.1;Database=prototype;User Id=pitt;Password=phunsanit;";
     }
     break;

    case "UAT":
     {
      dsns["dns1"] = "Server=127.0.0.1;Database=prototype_UAT;User Id=pitt;Password=phunsanit";
      dsns["dns1_replicate"] = "Server=127.0.0.1;Database=prototype_UAT;User Id=pitt;Password=phunsanit";
      dsns["dns2"] = "Server=127.0.0.1;Database=prototype_UAT;User Id=pitt;Password=phunsanit";
      dsns["dns2_replicate"] = "Server=127.0.0.1;Database=prototype_UAT;User Id=pitt;Password=phunsanit";
     }
     break;

   }

   return dsns;
  }

 }
}

  string dns1 = Configurations.DSNs()["dns1"].ToString();
  SqlConnection objConn = new SqlConnection(dns1);