title: DataTable Join all Rows Data
body: <p>Actually,I have a <code>DataTable</code> containing 2000 rows with a <code>ColumnName</code> <code>EMAIL</code>.
  Now,I want to show all emails from the <code>DataTable</code> and adding them to a <code>TextBox</code> by separating with a <code>,</code>.</p>
  
  <p>I am achieving this by a <code>for</code> loop,But,it is taking a long time.</p>
  
  <p>Actually,I have used for getting the <code>ColumnNames</code> :</p>
  
  <pre><code>string[] columnNames1 = (from dc in table.Columns.Cast&lt;DataColumn&gt;()
                                  select dc.ColumnName).ToArray();
  </code></pre>
  
  <p>Is there any thing like this,for <code>joining</code> all rows data to a single string ?</p>