title: linq to dataset equivalent of SQL LIKE clause
body: <p>What is the linq equivalent of a SQL clause like <code>WHERE UserName LIKE 'fr_d'</code>?</p>
  
  <p>I'm working with a dataset in memory rather than a SQL database so I don't think I can use something like <code>where SqlMethods.Like(p.UserName, "Fr_d")</code></p>
  
  <p>(Not that my installation of VS2008 is admitting that SqlMethods or even System.Data.Linq.SqlClient
  exist at the moment, but thats a whole different problem!)</p>