I have the below code. I am trying to remove the record and it is throwing Exception when it is removing the Record. "Collection was modified; enumeration operation may not execute."

Any ideas on how to get rid of the message. Appreciate your time.

//validClaimControlNo has valid ClaimControl Numbers.
List<string> validClaimControlNo = new List<string>();

int count = 0;
                foreach (List<Field> f in records)
                {
                    foreach (Field fe in f)
                    {
                        if (i == 0)
                            if (!(validClaimControlNo.Contains(fe.Value)))
                            {
                                //if this claim is not in the Valid list, Remove that Record
                                records.RemoveAt(count);
                            }
                        i++;
                    }
                    i = 0;
                    count++;
                }