how to get only line number and page name from stack trace in log file

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MVC

I am maintaining text file to store errors occurred into application using OnException method in BaseController. It stores error message and stack trace but stack trace is too long i want only line number and page from it..is it possible..how to do it
//code in Base Cotroller

protected override void OnException(ExceptionContext filterContext)
 {
base.OnException(filterContext);
this.SaveLog(filterContext.Exception);
}

 private void SaveLog(Exception e)
 {
 string filepath = AppDomain.CurrentDomain.BaseDirectory;
                string logFilePath = filepath + @"logs\error\log.txt";
 using (StreamWriter sw = System.IO.File.AppendText(logFilePath))
{
sw.WriteLine("Message: " + e.Message);
sw.WriteLine("StackTrace:"+ e.StackTrace);
}
sw.Close();
}