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WiX Install Get Value via Dialog and update Config File

So, I was looking at below.  I need to update the config file.  Connection String.  Any idea how to get the value from the user then update it?

https://ranjithk.wordpress.com/2009/11/06/wix-update-application-configuration-files-during-installation/
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CipherIS
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CipherIS
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Vadim RappCommented:
In MSI installations, all properties are set by one of the 4 ways:

1. the property is linked to a control in user dialog, so the user will specify it during the installation
2. the property is specified in command line when launching the installation (usually when the installation using method #1 is being run in quiet mode)
3. the property is found as the result of system search.
4. the property is set by custom action.

In your case, probably #1. https://www.firegiant.com/wix/tutorial/user-interface-revisited/ has tutorial.
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