Linq query not behaving as expected

Question

I have a very simple linq query which is as following:

var result = (from r in employeeRepo.GetAll()
              where r.EmployeeName.Contains(searchString         


        

Answer 1

If your text has NVARCHAR datatype check for similiar letters that in reality are not the same:

CREATE TABLE #employee (ID INT IDENTITY(1,1), EmployeeName NVARCHAR(100));

INSERT INTO #employee(EmployeeName) VALUES (N'waidаnde');

SELECT *
FROM #employee
WHERE EmployeeName LIKE '%waidande%';

-- checking
SELECT *
FROM #employee
WHERE CAST(EmployeeName AS VARCHAR(100)) <> EmployeeName;

db<>fiddle demo

Here: 'а' != 'a'. One is from Cyrillic 'a' and the second is normal.

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Idea taken from:

^{Slide from: http://sqlbits.com/Sessions/Event12/Revenge_The_SQL}

P.S. I highly recommend to watch Rob Volk's talk: Revenge: The SQL!.