As explained in MSDN: Directory.CreateDirectory:
You can create a directory on a remote computer, on a share that you have write access to. UNC paths are supported;
Keyword here being “UNC paths”, which take the following form:
\\server-name\share-name\[subdirectory-names\]
So:
Directory.CreateDirectory(@"\\server-name\share-name\NewFolder1");
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solved How to create folder on server pc in C# [duplicate]