title: Rowkey.ToLower() while querying on Azure table throws Exception
body: <p>Querying for an specific entity having e.RowKey.ToLower() throws an exception</p>
  
  <pre><code>CustomerEntity customerEntity = (from e in serviceContext.CreateQuery&lt;CustomerEntity&gt;("Customer")
                                       where e.RowKey.ToLower() == firstName.ToLower()                                         
                                       select e).FirstOrDefault();
  </code></pre>
  
  <p>Basically i want to check for case insensitive username..Azure table is managed by our partner so i can not instruct them to enter the User entry into table in lower case.</p>
  
  <p>I need to handle this in code.</p>
  
  <p>REgards,
  Vivek</p>