I haven't used Linqpad in a long time but one of the most useful features it had was the ability to add connections to your SQL Server databases and then write quick throwaway LINQ/Lambda style syntax queries against it, e.g.

   radios.GroupBy(x=> x.Channel).Select(x=>x.OrderBy(y=>y.Price)).Select(x=>x.First());

If I remember correctly, it also let you compare the LINQ query against the transpiled SQL so you could try to hand-optimize it a bit as well.