How to truncate a file in c#?

Question

I am writing actions done by the program in C# into a file by using Trace.Writeln() function. But the file is becoming too large. How to truncate this file when it grows to

Answer 1

Close the file and then reopen it using FileMode.Truncate.

Some log implementations archive the old file under an old name before reopening it, to preserve a larger set of data without any file getting too big.

Answer 2

As opposed to trying to do this yourself, I'd really recommend using something like log4net; it has a lot of this sort of useful functionality built in.