title: Sitecore 7 Content search .ToLower() method not supported, looking for alternatives
body: <p>I am working on sitecore 7.2 content search, I want to compare the document title with a string but In lowercase, When I use .ToLower() method in search clause, I get error that .ToLower() method is not supported, exact error is : 
  <code>8648 11:19:34 ERROR Unsupported string method: ToLowerInvariant.
  8648 11:19:34 ERROR    at Sitecore.ContentSearch.Linq.Parsing.ExpressionParser.VisitStringMethod(MethodCallExpression methodCall)</code></p>
  
  <p>Is there any way to do case insensitive string comparison?</p>