title: Error "Unable to find the requested .Net Framework Data Provider. It may not be installed"
body: <p>I am using Visual Studio 2008 and oracle database 10g.</p>
  
  <p>I trying to connect to the backend like this:</p>
  
  <p>Subwindow "Server explorer". Push button "Connect to database" and make next chain
  Data Connection->Choose Data Source->Oracle Database->oracle Data provider for .Net->Continue->Data Source name : oraclexe->Userneme: hr password: hr -> Test connection (answer "Test connected succeeded ")->push button OK and:</p>
  
  <pre><code>"Unable to find the requested .Net Framework Data Provider. It May not be installed"
  </code></pre>
  
  <p>I have made changes to machine.config</p>
  
  <pre><code>&lt;add name="Oracle Data Provider for .NET" 
  invariant="Oracle.DataAccess.Client" description="Oracle Data Provider for .NET"
  type="Oracle.DataAccess.Client.OracleClientFactory, 
  Oracle.DataAccess, Version=2.111.6.20, Culture=neutral, PublicKeyToken=89b483f429c47342" /&gt;
  </code></pre>
  
  <p>But then to same error persists. What to do?</p>