How can I setup One codebase for many Web Sites?

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How can I setup One codebase for many Web Sites?

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Trying to get ideas of how to do this....

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The situation that I have would be just to find a way to� point to different databases.

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The current situation is to duplicate the code base having the web config point to the different databases. I would like to eliminate the duplication of code base and have only one code base, but then how to solve the problem of configuring the unique web.config??

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Thanks in advance for any input.
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