Flat File Header

I am creating a header in flat file which is a destination. i want to pass the record count in the header.

I am creating an expression in the flat file connection manager properties. I am selecting 'HeaderRowDelimiter' in property box and experssion 

i am dragging my count variable (r1) as (DT_WSTR, 12)@[User::r1]. But  when i am executing the package, i am getting file as:

(DT_WSTR, 12)@[User::r1]

1,store manager

2,customer representative

3,regional manager

4,shift leader

5,district manager

Somehow it does not giving me the value of record count. I gives me (DT_WSTR, 12)@[User::r1] at the top.

Any suggestions as how to solve this problem

Thanks

See if this helps.

http://www.bidn.com/blogs/KeithHyer/bidn-blog/1990/adding-a-header-or-footer-row-to-a-fixed-width-file-using-ssis