title: Find the datatype of Field from DataReader object
body: <p>I have following query:</p>
  
  <pre><code>SqlCommand cmd = new SqlCommand("Select employee_id, 
            lastname, firstname from Employees", conn);
  
  // Execute reader
  SqlDataReader reader = cmd.ExecuteReader();
  </code></pre>
  
  <p>Suppose I want to know the datatype of field <code>employee_id</code>. How do I determine this using the <code>SqlDataReader</code>?</p>