How to create log file in c#

Please visit these useful link about create log file in c#.

logging - How to write log file in c#? - Stack Overflow[^]

http://www.dotnetpickles.com/2013/03/code-to-create-log-files-in-cnetaspnet.html[^]

How to Create Log File in C#[^]

TRY...CATCH is the best practice to catch the exception (may be you can use exception.stackTrace for more detail log), but there are many different ways to write and maintain log.
1. stored .txt file at application startup path
2. store log in database, (but if application crash in between many time database connection gets lost and will get only last updated message not exact code line)
3. Stored log in system's application event log

if you look for performance then I may suggest you 'StringBuilder', as it is fast and append all text easily
look at below sample

StringBuilder sb;
...
sb.Append("log something");

...
// flush every 20 seconds as you do it
File.AppendAllText(filePath+"log.txt", sb.ToString());
sb.Clear();

look at below link for more details of log writing
How to write in log Files in C#[^]