public class DbStatus
{
    public static bool DbOnline()
    {
        const int MaxRetries = 10;
        int count = 0;

        while (count < MaxRetries)
        {
            try
            {
                // Just access the database. any cheap query is ok since we don't care about the result.
                return true;
            }
            catch (Exception ex)
            {
                Thread.Sleep(30000);
                count++;
            }
        }
        return false;
    }
}

processInstaller.Account = ServiceAccount.LocalSystem;
processInstaller.Username = null;
processInstaller.Password = null;

using (ServiceInstaller installer = new ServiceInstaller())

{
    installer.DisplayName = "yourservice.";
    installer.StartType = ServiceStartMode.Automatic;
    installer.ServiceName = "YourService";



    installer.ServicesDependedOn = new string [] { "DependenceService" };
    this.Installers.Add(processInstaller);
    this.Installers.Add(installer);

}