How to unzip a password protected zip files

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C#

Hi to All

I need sample coding to unzip a password protected zip files for my project..

I know the password.. but now i have to give password for each zip file n extract separately.. password is same for all files.. so once if i give password through coding it will be easy for me..

Its very urgent..

Can anybody help for me?

With regards,

Angelaromith