public static UtilidadesBL GetInstance()
{
if (singletonInstance == null)
singletonInstance = new UtilidadesBL();
return singletonInstance;
}
public Login()
{
this.usuarioBL = UsuarioBL.GetInstance();
this.periodoBL = PeriodoBL.GetInstance();
this.utilidadesBL = UtilidadesBL.GetInstance();
}