title: Error "The type or namespace name could not be found" during a build process
body: <p>I'm using in C# Windows Application, I have using </p>
  
  <p>TempProWin --> For Windows Application Projects<br>
  TempProApp --> For Database and functionality like Class File using CSLA Method.</p>
  
  <p>In TempProWin.frmLogin.cs:</p>
  
  <pre><code>using System;
  using System.Collections.Generic;
  using System.ComponentModel;
  using System.Data;
  using System.Drawing;
  using System.Linq;
  using System.Text;
  using System.Windows.Forms;
  using  TempProApp;
  
  private void frmLogin_Load(object sender, EventArgs e)
  {
   UserLoginList oUserLoginList = UserLoginList.GetUserLoginList();
   cmbUserName.DataSource = oUserLoginList;
   cmbUserName.DisplayMember = "Select User";
  }
  </code></pre>
  
  <p>But When I build this application, I got the following error:</p>
  
  <blockquote>
    <p>Error 5   The type or namespace name 'TempProApp' could not be found (are you missing a using directive or an assembly reference?)</p>
  </blockquote>
  
  <p>I already include reference of TempProApp.dll from the path of D:\TempPro\TempProApp\bin\Debug</p>