title: DataTable does not contain definition for AsEnumerable
body: <p>Using linq to query a datatable returns the following error:  CS0117: 'DataSet1.map DataTable' does not contain a definition for 'AsEnumerable'  </p>
  
  <p>Project includes reference for System.Data.Datasetextensions. </p>
  
  <p>Here's the code.</p>
  
  <pre><code>using System;
  using System.Collections;
  using System.ComponentModel;
  using System.Configuration;
  using System.Reflection;
  using System.Data;
  using System.Linq;
  using System.Data.Linq;
  using System.Data.Common;
  using System.Data.DataSetExtensions;
  using System.Linq.Expressions;
  using System.Web;
  using System.Web.Security;
  using System.Web.UI;
  using System.Web.UI.HtmlControls;
  using System.Web.UI.WebControls;
  using System.Web.UI.WebControls.WebParts;
  using System.Xml.Linq;
  using System.Data.SqlClient;
  
  protected void Page_Load(object sender, EventArgs e)
      {
          var query1 = from mfg_nm in DataSet1.mapDataTable.AsEnumerable()
  
                       select mfg_nm;
  }
  </code></pre>
  
  <p>running it w/out AsEnumerable() results in</p>
  
  <pre><code>var query1 = from mfg_nm in DataSet1.mapDataTable
  
                       select mfg_nm;
  </code></pre>
  
  <p>CS1660: Cannot convert lambda expression to type 'string' because it is not a delegate type</p>
  
  <p>thanks in advance for your help</p>