delete aws instances on a tag

delete.cs

        static void Main(string[] args)
        {
            var t = new Amazon.EC2.AmazonEC2Client("key", "scrt", Amazon.RegionEndpoint.USEast1);
            string nextToken = null;
            var lst = new List<Instance>();
            do
            {
                var instances = t.DescribeInstances(new Amazon.EC2.Model.DescribeInstancesRequest() { NextToken = nextToken });
                nextToken = instances.NextToken;
                lst.AddRange(instances.Reservations.SelectMany(a=>a.Instances).Where(a=>a.Tags.Any(b=>b.Key == "key" && b.Value == "value")));
            } while (!string.IsNullOrEmpty(nextToken));
            t.TerminateInstances(new TerminateInstancesRequest() { InstanceIds = lst.Select(a => a.InstanceId).ToList() });
        }