public void Contains()
{
var db = SqlServerNorthwindDatabase();
SqlSet <SqlSetAnnotated.Model1.Product> table = db.Table <SqlSetAnnotated.Model1.Product>();
var prod1 = table.Single("ProductID = 1");
Assert.IsTrue(table.Contains(prod1));
Assert.IsFalse(table.Where("ProductID = 2").Contains(prod1));
}