C# EventLog.WriteEntry fail for some strings but not for others

Question

Having problem to write on windows event log with c#.

public static void writeToEventLog(string msgGrid, string msgIntern, EventLogEntryType entryType)  
{  
    string grp = "Application"; // Fixed because cant create new but happy if bellow works.  
    if (!EventLog.SourceExists(msgGrid)) { EventLog.CreateEventSource(msgGrid, grp); }  
    EventLog.WriteEntry(msgGrid, msgIntern, entryType);  
}  

---

// The folowing code dont put entry on event log:

string msgGrid = "pdtidtijejrnexhr";  
string msgIntern = "*-* [Dt:2013-10-31 11:41:10.00][digkufdufe:{[<2013-10-31 11:41:09> {jpdriskrt01} jpdriskrt01[172.22.3.70:57010]> [pdtidhry jrnecidr]]} : {}] >>#[eydshr:(rhrdhruiweirts.hrt.krt.krtjelr.jt.jpdrtjelkrhtw.<dnjr>b__1)]>>#[jpdrtjelkrhtw]\\[pdtidtijejrnexhr]\r\n";

writeToEventLog(msgGrid, msgIntern, EventLogEntryType.FailureAudit);

---

// The folowing code works OK:

writeToEventLog("t1", "t2", EventLogEntryType.FailureAudit);

There is some constraint about log content or size ?

Answer 1

It looks like your source ("pdtidtijejrnexhr") doesn't exist yet, but "t1" does, so that's why the other snippet of code is working. Also, you may have to double-up your braces ({ and }), but I'm not positive on that one. ({{ and }}, respectively).

I don't think "t1" comes with Windows by default.. I suspect that your code successfully created it at one point (maybe in combination with when you weren't using braces in a log message?)