How to compress a folder items to get less size.

On Windows, you right click the folder mouse of "Send to" then click "Compress to Zip file" or something (I'm not home so I can't say for sure) and to unzip it, using Winrar or 7zip, you right click the folder then click "Extract"

thats right but how we can it by code.

Are you wanting to compress your own folders or other users? in addition, what programming language do you prefer ? I don't think you can do it in solo learn but I will try to give you the resources I know to help you :)

i want to compress a specific folder in c#. just the code.