I need Help on Upgrading a C# application which is delivered to client

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C#

We are developing a project and now i need some help on Upgrading the software after we deliver it to the client through ONline.


we develop in c#, and the way i want it to be is .

1. we sell the product.
2. when client tries to install it, the product must check for any update in our server.
3. if it finds an updated version it should connect to server
4.It should only download the Updates from the server and install in the client and Upgrade to he latest verion.


I dont want the whole(latest) product again to be downloaded and install in the client system.

I want only the updates to be installed which usually will be in KB's.

thanks in advance