String.IsNullOrEmpty in LINQ To SQL query?

I don't know if that works, but I'm sure this does:

where (result.Info ?? "") != ""

(strongly recommend the parens, query generator can get confused without them)

Curiously, per MSDN String.IsNullOrEmpty is supported (by virtue of it not being unsupported), yet I can only find complaints about it not being supported.

However, if it does work you should not explicitly compare it to a boolean value, instead:

var results = from result in context.Records
          /*XXX broke :( where !String.IsNullOrEmpty(result.Info) */
          where !(result.Info == null || result.Info.Equals(""))
          select result;

It is not supported since attempting to use it results in a NotSupportedException being thrown with this message:

Method 'Boolean IsNullOrEmpty(System.String)' has no supported translation to SQL.

Instead, you can use this approach to do the same thing:

var results = from result in context.Records
              where result.Info != null && result.Info.Length > 0
              select result;

You may also use result.Info != String.Empty instead of checking the length. Both approaches will work.