How to entity framework update table one column C#?

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C#

The following code has 9 records, finds 9 records. Savechanges as it updates the record it found but it does not update Where is the error how can I update.



There are 9 records. I want to update the gender part of these records.

Table column:
PersonNo,Name,Surname,Gender,Birthdate

What I have tried:

var personelUpdate = entities.person.AsNoTracking().Where(x => x.Gender == "Male").
                ToList();


            if (personUpdate.Count() != 0)
            {
                foreach (var item in personUpdate)
                {
                    item.Gender = "NOT KNOW";
                    entities.SaveChanges();
                }
            }