Missing Entries From Logs

[mnitin]

i have a log file which doesnot have complete data.
my tables have more number of records as compared to log file.
i am using webservices.
the logs get updated after the tables are updated and i am using mutex to handle multiple requests but i am not able to get all the record in log file as in table.
Is there any Timeout occuring which will cause my logs to stop writing in between or there is a problem with mutex..

Private Sub WriteToLog(ByVal Content As String)

Dim mutexFile As Mutex = New Mutex(False, "OPS_LogFileMutex")

Try
mutexFile.WaitOne() 'Wait until the file is open
Log(Content, _logFilePath & "\" & _logFileName)
Catch ex As Exception
Finally
mutexFile.ReleaseMutex()
End Try


Private Sub Log(ByVal Content As String, ByVal FileName As String)
Dim LogFile As New StreamWriter(FileName, True)
Try
LogFile.WriteLine(Content)
Catch ex As Exception
System.Diagnostics.EventLog.WriteEntry("TESTServic e", ex.Message)
Finally
LogFile.Close()
End Try