title: How to use SimpleMembership in MVC with Entity Framework
body: <p>I want to use SimpleMembership in an MVC 3 website, but I'm getting the following error:</p>
  
  <pre><code>System.ArgumentException was unhandled by user code. Unable to find the requested .Net Framework Data Provider. It may not be installed.
  </code></pre>
  
  <p>I'm using a SQL Server database, through Entity Framework. Here is my connection string:</p>
  
  <pre><code>&lt;add name="Database1Entities" connectionString="metadata=res://*/Models.Model1.csdl|res://*/Models.Model1.ssdl|res://*/Models.Model1.msl;provider=System.Data.SqlClient;provider connection string=&amp;quot;data source=.\SQLEXPRESS;attachdbfilename=|DataDirectory|\Database1.mdf;integrated security=True;user instance=True;multipleactiveresultsets=True;App=EntityFramework&amp;quot;" providerName="System.Data.EntityClient" /&gt;
  </code></pre>
  
  <p>I already use EF in other parts of the application, so this connection string is correct and I have connection to the database. Can you please help?</p>