private void RollFillIfOverSizeLimit()
{
var fileInfo = new FileInfo(filePath);
if (fileInfo.Length < fileSizeLimitBytes)
{
return;
}
var newFileName = "Old_" + Path.GetFileName(filePath);
newFileName = Path.Combine(targetFolder, newFileName);
File.Copy(filePath, newFileName, true);
DeleteLogFile();
}