Edit environment variable in registry

Question

I want to read all environment variable from the registry and set a new value for it with c# in visual studio 2010 express.

Thus I read the subkey of local machine:

SYSTEM\CurrentControlSet\Control\Session Manager\Environment

and there the value of Path.
While reading the Path value:

reg = Registry.LocalMachine.OpenSubKey(SUB_KEY_PATH, true);

I get an exception, that i don't have the permission for it.

Therefore I set the value in the manifest:

<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />

But now I can’t compile my project, because ClickOnce doesn’t support it. How can I compile a project with security level of requireAdministrator? One solution I found is to compile it without the requireAdministrator level and afterwards I changed the value in myproject.exe.manifest. Did i see it right, that I always have to copy both files (manifest & exe-file) to another computer to run it correctly? Is it possible to put the information in the exe-file by compiling?

You don't disable it, you simply don't use it to deploy your product. And use a regular installer, as created by a Setup and Deployment project. Not available in the Express edition. — Hans Passant
– Hans Passant, Commented Oct 29, 2011 at 15:39

David Heffernan · Accepted Answer · 2011-10-29 18:08:40Z

If you want to elevate during installation then you can't use ClickOnce. That's a design choice. Your options therefore are:

Use a standard install package which will allow you to show the UAC elevation dialog.
Modify the user's PATH environment rather than the system-wide variable. This option is perfectly compatible with the per-user philosophy of ClickOnce.

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