I solved the issue as per the article,
i removed all sap CR soft from devlopment machine
this includes both CR runtime 64 bit and CR for VS (V184.108.40.2065)
My VS version : 2010 Ultimate
My mahcine and OS: windows 7 / 64 bit
Now my application able to export the content.
I thought this would help some one else, so registered in this website to reply this comment as solution for this problem.
thanks for saving my time.