Comparing Strings in C#

Compare.cs

public class Compare
{
        public IActionResult ToLower()
        {

            var all = _db.Users.ToList();
            var now = DateTime.Now;
            int jacksCount = 0;

            for (int i = 0; i < 1000; i++)
            {
                jacksCount = all.Where(u => u.Givenname.ToLower() == "jack").Count();
            }

            var duration = (DateTime.Now - now).TotalSeconds;
            return Ok(jacksCount.ToString() + " , Time : " + duration);
        }



        public IActionResult Equal()
        {

            var all = _db.Users.ToList();
            var now = DateTime.Now;
            int jacksCount = 0;
            for (int i = 0; i < 1000; i++)
            {
                jacksCount = all.Where(u => string.Equals(u.Givenname, "jack", StringComparison.OrdinalIgnoreCase)).Count();
            }

            var duration = (DateTime.Now - now).TotalSeconds;

            return Ok(jacksCount + " , Time : " + duration);
        }
}

great tip! thx