Hi,

Based on my understanding, you have a ClickOnce deployed VB.NET application
whose 'Make single instance application' feature has been turned on. You
lunch the application via a Url. When you lunch the application for the
first time, the Startup event is fired. When you lunch the application for
the second time, the StartupNextInstance event is raised. The problem is
that the call to
'ApplicationDeployment.CurrentDeployment.ActivationUri.Query' returns the
same result in the handler of the Startup event as it does in that of the
StartupNextInstance event. If I'm off base, please feel free to let me know.

I have performed a test based on my above understanding. I publish the
application to a Web site/ file path. I navigate the web page/shared file
path and lunch the application twice. The result is that the call to  
'ApplicationDeployment.CurrentDeployment.ActivationUri.Query' in both the
handlers of Startup and StartupNextInstance events return NULL.

I have found an example on MSDN on how to retrieve the URL parameters by
using ActivationUri. You may have a try on it to see if it could solve your
problem.

'ApplicationDeployment.ActivationUri Property'
http://msdn2.microsoft.com/en-us/library/system.deployment.application.appli
cationdeployment.activationuri.aspx

Hope this helps.
If you have any concerns, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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