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EF 4.0 Linq generates weird query when using string.contains with a variable instead of hard coded string
var query = context.Set.Where(o => o.Email.Contains("Mail@gmail.com"));
var stringQuery = ((System.Data.Objects.ObjectQuery)query).ToTraceString();

SELECT *
FROM [SET] AS [Extent1]
WHERE [Extent1].[Email] LIKE '%Mail@gmail.com%'

string email = "Mail@gmail.com";
var query = context.Set.Where(o => o.Email.Contains(email));
var stringQuery = ((System.Data.Objects.ObjectQuery)query).ToTraceString();

SELECT *
FROM [Set] AS [Extent1]
WHERE [Extent1].[Email] LIKE @p__linq__0 ESCAPE N'~'