c# binary writer delete some portion of text in a file

Question

Hi

I am writing the below structure in to the file using Binary Writer.
File Structure:
Num of Employees {employee num & name, employee1 num & name, employee2 num & name...}.

I will get a command with employee num to delete that particualr employee details and update Num of employees feild accordingly.

What is the best way to do the above operation?

Regards Raju