Updation of Iphone application

Hello,
Please can an any one tell me how to update my iphone application...when the user of my iphone application want to update the app with new version means without unistalling the old app he should able to update with new version of my application....what are the changes i have to do in my new application....Please can any one tel me about this...
Thank U...:)

You have to write the code; it's not automatic.
And you can supply data after an app is in the store; executable code is not allowed.

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