Amazon.EC2.AmazonEC2Client.ModifyInstanceAttribute C# (CSharp) Method

        internal ModifyInstanceAttributeResponse ModifyInstanceAttribute(ModifyInstanceAttributeRequest request)
        {
            var marshaller = new ModifyInstanceAttributeRequestMarshaller();
            var unmarshaller = ModifyInstanceAttributeResponseUnmarshaller.Instance;

            return Invoke<ModifyInstanceAttributeRequest,ModifyInstanceAttributeResponse>(request, marshaller, unmarshaller);
        }

        private static void ManageInstanceSecurityGroups()
        {
            IAmazonEC2 ec2 = new Amazon.EC2.AmazonEC2Client();
            DescribeInstancesResponse instanceResponse = ec2.DescribeInstances();

            foreach (var reservation in instanceResponse.Reservations)
            {
                foreach (var rInstance in reservation.Instances)
                {
                    var securityGroupList = new List <string>();
                    foreach (var groupIdentifier in rInstance.SecurityGroups)
                    {
                        securityGroupList.Add(groupIdentifier.GroupId);
                    }
                    if (!securityGroupList.Contains("sg-9cc4a3fb"))
                    {
                        securityGroupList.Add("sg-9cc4a3fb");
                    }
                    else
                    {
                        securityGroupList.Remove("sg-9cc4a3fb");
                    }
                    var modifyInstanceAttributeRequest = new ModifyInstanceAttributeRequest();
                    modifyInstanceAttributeRequest.InstanceId = rInstance.InstanceId;
                    modifyInstanceAttributeRequest.Groups     = securityGroupList;
                    try
                    {
                        ec2.ModifyInstanceAttribute(modifyInstanceAttributeRequest);
                    }
                    catch (Exception)
                    {
                    }
                }
            }
        }