if (!EventLog.SourceExists("TestCategory"))
    EventLog.CreateEventSource("TestCategory", "TestLog");

EventLog evtLog = new EventLog();
evtLog.Source = "TestCategory";
evtLog.WriteEntry("This is a test", EventLogEntryType.Information);

public void MoveDirectory(
    string strSourceDir, 
    string strDestDir, 
    bool bDelSource)
{
    if (Directory.Exists(strSourceDir))
    {
        if (Directory.GetDirectoryRoot(strSourceDir) == 
            Directory.GetDirectoryRoot(strDestDir)) 
        {   
            Directory.Move(strSourceDir, strDestDir);
        }
        else
        {
            try
            {
                CopyDirectory(new DirectoryInfo(strSourceDir), 
                    new DirectoryInfo(strDestDir));
                if (bDelSource)
                    Directory.Delete(strSourceDir, true);
            }
            catch (Exception subEx)
            {
                throw subEx;
            }
        }
    }
}

private void CopyDirectory(
    DirectoryInfo diSourceDir, 
    DirectoryInfo diDestDir)
{
    if (!diDestDir.Exists)
        diDestDir.Create();

    FileInfo[] fiSrcFiles = diSourceDir.GetFiles();

    foreach (FileInfo fiSrcFile in fiSrcFiles)
        fiSrcFile.CopyTo(Path.Combine(diDestDir.FullName, fiSrcFile.Name));

    DirectoryInfo[] diSrcDirectories = diSourceDir.GetDirectories();
    
    foreach (DirectoryInfo diSrcDirectory in diSrcDirectories)
        CopyDirectory(
            diSrcDirectory, 
            new DirectoryInfo(
                Path.Combine(diDestDir.FullName, diSrcDirectory.Name)));
}