How to handle race condition in EWS TraceListener while writing traces to the file

Question

I'm trying to write the request response traces to a file in an EWS Managed API client application. The problem is, at a time there are multiple requests/response (multiple emails) traces logged in a file, due to which race condition occurs resulting in "The process cannot access the file because it is being used by another process." error.

Adding lock worked , but I wanted check if there's any other better way to handle this scenario

public class TraceListener : ITraceListener
{
    private static object leadLock = new object();
    private readonly string traceFilePath;
    private readonly ILogger _logger;
    private readonly string traceFileName;
    private readonly bool enableTrace;

    public TraceListener(ILogger<TraceListener> logger, IConfiguration configuration)
    {
        traceFilePath = configuration["TraceFilePath"];
        traceFileName = configuration["TraceFileName"];
        bool.TryParse(configuration["EnableTrace"], out enableTrace);

        _logger = logger;
    }
    #region ITraceListener Members
    public void Trace(string traceType, string traceMessage)
    {
        if (enableTrace)
            CreateTextFile(traceType, traceMessage.ToString());
    }
    #endregion

    public void CreateTextFile(string fileName, string traceContent)
    {

        try
        {
            lock (leadLock)
            {
                Directory.CreateDirectory(traceFilePath);
                File.AppendAllText(Path.Combine(traceFilePath, fileName + ".txt"), traceContent);
            }


        }
        catch (Exception ex)
        {
            _logger.LogWarning("Error occured while writing traces to the file");

        }
        finally
        {
            _logger.LogInformation("TraceListner ended");
        }
    }
}