title: How To Access Namespace Created In Any Folder Into Code Behind For C#
body: <p>I have created a folder in my website in asp.net C# usindg VS'10 ,,</p>
  
  <p>Now i added a class into that folder with namespace as under:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.Linq;
  using System.Web;
  
  namespace ThreeTierSample.BLL
  {
    /// &lt;summary&gt;
    /// Summary description for Student
    /// &lt;/summary&gt;
  public class Student
  {
      public Student()
      {
          //
          // TODO: Add constructor logic here
          //
      }
  
  
      public void insert()
      { 
  
      }
    }
  </code></pre>
  
  <p>}</p>
  
  <p>I want to use this namespace into code behind file for that i'm trying to include namespace with statement :</p>
  
  <pre><code>using ThreeTierSample.BLL
  </code></pre>
  
  <p>but the problem is that it will not allow me to add this namespace even it doent show in intellisence.</p>
  
  <p>Help me to resolve this issue.</p>
  
  <p>Below is the screen shot of my project hierarchy: </p>
  
  <p><img src="https://i.stack.imgur.com/POTFk.png" alt="enter image description here"></p>