C# JSON save to and load from file

JSONWriteRead.cs

[DataContract]
public class UserInputs
    {
        [DataMember]
        internal string ServerName;
        [DataMember]
        internal string IpAddress;
        [DataMember]
        internal int Port;
    }

void Save(string JsonFileName)
        {
            var userInputs = new UserInputs { ServerName = "Local", IpAddress = "127.0.0.1", Port = 13000};
            var stream1 = new MemoryStream();
            var ser = new DataContractJsonSerializer(typeof(UserInputs));
            ser.WriteObject(stream1, userInputs);
            using (var fileStream = File.Create(JsonFileName))
            {
                stream1.Seek(0, SeekOrigin.Begin);
                stream1.CopyTo(fileStream);
            }
        }

void Load(string JsonFileName)
        {
            var fsSource = new FileStream(JsonFileName, FileMode.Open, FileAccess.Read) {Position = 0};
            var ser = new DataContractJsonSerializer(typeof(UserInputs));
            var userInputs = (UserInputs)ser.ReadObject(fsSource);
            MessageBox.Show(userInputs.IpAddress);
        }