List clientID

Hi, I only want the a subject if there are items in the list.

Then I only want a subject line to be created if there is a record belonging to the current user (clientID).

The below code skips through and creates a subject line for all clients in the table / list.

var PLC = _context.PLCBlock.FirstOrDefault();
                if (PLC != null)
                {
                    BodyContent = $"";
                //}

                var Blocks = _context.PLCBlock.ToList();
                //var Blocks = from s in _context.PLCBlock.ToList()
                //                where s.clientID == User.Identity.Name
                //                select s;

               
                var BodyContentTemp = "";
                foreach (var s in Blocks)
                    {
                        if (s.clientID == User.Identity.Name)
                        {
                        BodyContentTemp = $"The PLC Type is a {s.BlockType} with Number {s.Number} and with a Description of {s.Description}\r\n";
                        BodyContent = BodyContent + BodyContentTemp;
                        }
                    }
                }

Thanks,