c# StreamWriter input string is not the same on the output string on the file

Question

I am having a problem with my StreamWriter. I'm using Visual Studion 2010 and 2015, .NET Framework 4.0. Here is the sample of my Code to write a log file:

using (StreamWriter swErr = new StreamWriter(HostingEnvironment.MapPath("~/Logs/") +
            DateTime.Now.ToString("yyyyMMdd") + ".log", true, Encoding.Default))
{ 
    if (!string.IsNullOrEmpty(errMsg))
        swErr.WriteLine(DateTime.Now.ToString("HH:mm:ss " + errMsg));
    if (result != null && result.Count > 0)
        foreach (Mandrill.EmailResult x in result)
        {
            stat = string.Format("{0} | {1} | {2} | {3}",
                        x.Id, x.Email, x.Status, x.RejectReason ?? "-"
            );
            Console.WriteLine(stat);
            swErr.WriteLine(DateTime.Now.ToString("HH:mm:ss " + stat));
        }
    if (!string.IsNullOrEmpty(errMsg) || (result != null && result.Count > 0))
        swErr.WriteLine("---");
}

For some reason, here is the sample Expected vs Actual output of this code:

Expected OUTPUT:

10:10:02 e7424f10d1ee431fb69d9014265b278a | tito.genovajr@paramount.com.ph | Sent

----------



ACTUAL OUTPUT

10:10:02 e742431091ee4313b6999014265b278a | AiAo.A.D.enovajr@para10ounA.co10.p10 | SenA

----------

For some reason I do not know it converts some character to a random number or letter(s). I tried removing the parameter of StreamWriter for Encoding, also tried passing Encoding.ASCII and Encoding.UTF8 but it's still the same.

I think my syntax is OK and handled the disposing of the StreamWriter properly.

I hope anyone can help me regarding this.

Thanks!

Answer 1

For the ones who will encounter this question. I'm really sorry for my stupidity but this is a syntax error. The error message is included on the string formatting of the date.

DateTime.Now.ToString("HH:mm:ss" + errMsg);

This must be:

DateTime.Now.ToString("HH:mm:ss") + errMsg;

Hope any other person would not encounter this.