using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public static string DefaultDataSourceName

    {

        get

        {

            string machineName = Environment.MachineName;

            string name = machineName;

            Microsoft.Win32.RegistryKey key = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL", false);

            if (key != null)

            {

                foreach (var instanceName in key.GetValueNames())

                {

                    name = machineName + "\\" + instanceName;

                    break;

                }  

                key.Close();

            }

            return name;

        }

    }

}