namespace not showing in other Class file

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C#3.5

Hi frnds,
I added three class Library to my Project .In that i added some class to every class Library.I am not able to get link over class library namespace...Namespace is not coming other class.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using BAL;----Here BAL namespace is not showing

namespace DAL
{
    public class Class1
    {

    }
}