title: There is no build provider registered for the extension '.dll'
body: <p>I'm trying to reference to a .dll file from a .aspx web page.  However, I get the following error:</p>
  
  <pre><code>Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.
  
  Parser Error Message: There is no build provider registered for the extension '.dll'. You can register one in the &lt;compilation&gt;&lt;buildProviders&gt; section in machine.config or web.config. Make sure is has a BuildProviderAppliesToAttribute attribute which includes the value 'Web' or 'All'.
  
  Source Error: 
  
  Line 2:  &lt;%@ Page Title="" Language="C#"   MasterPageFile="CSharpBPTestMaster.master" AutoEventWireup="true" CodeFile="CSharpBPTest.aspx.cs" Inherits="Button"  Debug="true"%&gt;  
  Line 3:  
  Line 4:  &lt;%@ Register tagprefix="blnc" tagname="Balanced" src="bin/Debug/BalancedTest.dll" %&gt;
  Line 5:  
  Line 6:
  
  Source File: /preview/1/balanced-csharp-master/src/BalancedTest/CSharpBPTest.aspx    Line: 4 
  </code></pre>
  
  <p>I'm not sure what I'm doing wrong.  I build the .csproj file.  I have the following in <code>bin\Debug\</code>:</p>
  
  <ul>
  <li>Balanced.dll </li>
  <li>Balanced.pdb </li>
  <li>BalancedTest.dll </li>
  <li>BalancedTest.pdb</li>
  </ul>
  
  <p>Here is my <code>CSharpBPTest.aspx</code>:</p>
  
  <pre><code>&lt;%@ Page Title="" Language="C#"   MasterPageFile="CSharpBPTestMaster.master" AutoEventWireup="true" CodeFile="CSharpBPTest.aspx.cs" Inherits="Button"  Debug="true"%&gt;   
  
  &lt;%@ Register tagprefix="blnc" tagname="Balanced" src="bin/Debug/BalancedTest.dll" %&gt;
  
  
  &lt;asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" 
      Runat="Server"&gt;
      &lt;form id="form1" runat="server"&gt;
      &lt;div&gt;
  
  
      &lt;asp:Button ID="button1" runat="server" Text="Submit" OnClick="Button_Command"/&gt;
  
      &lt;br /&gt;
  
  
      &lt;br /&gt;
              &lt;br&gt;&lt;asp:label id="warningLabel" Text="" ForeColor="Red" runat="server"/&gt;&lt;br&gt;
      &lt;br /&gt;  
  
  
      &lt;/div&gt;
      &lt;/form&gt;
  &lt;/asp:Content&gt;
  </code></pre>
  
  <p>And in my C# file, I "import" the project like this (at the top):</p>
  
  <pre><code>using Balanced;
  </code></pre>
  
  <p>I want to be able to use this compiled .dll file on my C# side.  The Balanced.dll is an external library.  It just came with the files and a .csproj file.  I did a build and now I'm trying to use this Balanced.dll file.  Am I missing something?  I'm sorry if this is a bad question.  I'm new to asp.net and csproj.</p>