Click-once deployment version number

ion.ApplicationDeployment.CurrentDeployment.CurrentVersion

Of course you'd want to ensure that the application was actually deployed using ClickOnce before relying on that data by using something like:
System.Deployment.Application.ApplicationDeployment.IsNetworkDeployed

I dont know of any way to automatically update the assembly version with the ClickOnce version (other than installing some sort of macro into Visual Studio). But that of course doesn't mean there isn't a way - perhaps someone else might be able to suggest one?

Hope this helps, let us know how you go,