C# UNC path stills works when using NetUseDel

Dani_S 2,726

Hi,
I connect to UNC using C# NetUseAdd
NetUseAdd(null, 2, ref useinfo, out paramErrorIndex);
But when I use NetUseDel -NetUseDel(null, _uncPath, 2)
UNC path stills works.
How is can be solved ?
Thanks,

Junjie Zhu - MSFT 15,056 Reputation points Microsoft Vendor

2022-05-09T13:11:56.727+00:00

There is a document can refer to. [NetUseDel] https://learn.microsoft.com/en-us/windows/win32/api/lmuse/nf-lmuse-netusedel#remarks
If the function does not work, what is the error message, or what is the return value of NetUseDel?
Junjie Zhu - MSFT 15,056 Reputation points Microsoft Vendor

2022-05-19T08:57:38.187+00:00

It's been a few days, do you have any progress?

Accepted answer

Bruce (SqlWork.com) 56,766 Reputation points

2022-05-08T15:28:38.403+00:00

The NetUseAdd function creates a connection to a server, the same as using the net use utility. The windows file system supports UNC paths internally and doesn’t require a pre-existing connection.

Note: creating a connection is handy when the credentials required are not the logged user or you want a mapped drive.
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Dani_S 2,726 Reputation points

2022-05-08T18:38:52.12+00:00

Thanks for answer.
How do I know if credentials required or not for given directory , (not the logged user)?
What is mapped drive?

Bruce (SqlWork.com) 56,766 Reputation points

2022-05-09T14:44:12.537+00:00

A mapped drive is a remote share mapped to a drive letter. See net use cli

https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2012-r2-and-2012/gg651155(v=ws.11)

You need credentials if the logged in user is a local account rather than domain, or the user does not have access to the server.

If you access the UNC share without net use, it just uses the process owner account.

var path = “\\server\path\foo.txt” using var fs = File.Open(path, FileMode.Open, FileAccess.Write, FileShare.None));

Just requires that the process owner is a domain account with access to the unc share, otherwise it will throw a permission error.

It running as a nt service, the service account would need to be a domain account with access to the unc share.
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C# UNC path stills works when using NetUseDel

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