How to Dynamically Generate ,Transform, or Modify a web.config file (Config transformation)

Dynamic config transform can be used to automatically creating multiple version of web.config from a main config file. This techniques is used to creates build for different environments like DEV,TEST,Production.

How to implement Config Transform (dynamic config mapping ) (Step By step) 

 Create a simple ASP.Net Project

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GO to Build>>Configuration Manager

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Select new in drop down

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Provide name of configuration like “Release.PROD”
Also select Base build definitions like “Release”

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Now Click Close
Right Click on project >>Add Config Transform

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Now you will see new config generated as below

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Now open the newly created configuration file >>Web.Release.Prod.config” and con comment following section

Modify “name=MyDB” >> name="ApplicationServices" ( as defined in main config file)

Now you new transform is ready to use. Select new build type from drop down

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Then Right Click on Project >>Publish , Provide necessary information and publish you project to destination as release Build

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Check out the final configuration generated and deploy location it will have required tronsform

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Further References

1. Config transform provide more smart replacement syntax that can be found at http://msdn.microsoft.com/en-us/library/dd465326.aspx
2. MSDN Articles http://msdn.microsoft.com/en-us/library/dd465318.aspx
3. MSDN Videos http://msdn.microsoft.com/en-us/vstudio/ff801895.aspx