I have a sharepoint server on which some files are hosted. I have some

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Asked: May 17, 20262026-05-17T19:50:46+00:00 2026-05-17T19:50:46+00:00

I have a sharepoint server on which some files are hosted. I have some

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I have a sharepoint server on which some files are hosted.

I have some .Net code that creates a WebRequest to GET some of the files. This is is working correctly.

When I try to use similar code to PUT a file at the same location, I’m getting a:

System.Net.WebException: The remote server returned an error: (405) Method Not Allowed on my request.GetResponse();

I am not getting any InnerExceptions.

Here is my code:

        var requestPath = Path.Combine(serverBasePath, library.GetLibraryPath(), Path.GetFileName(filePath));

        var request = WebRequest.Create(requestPath);
        request.Credentials = CredentialCache.DefaultNetworkCredentials;
        request.Method = "PUT";
        var buffer = new byte[1024];

        using (var requestStream = request.GetRequestStream())
        using (var fileStream = new FileStream(filePath, FileMode.Open))
            for (int i = fileStream.Read(buffer, 0, buffer.Length); i > 0; i = fileStream.Read(buffer, 0, buffer.Length))
                requestStream.Write(buffer, 0, i);


        using (request.GetResponse()) { }

        return requestPath;

Using the same code (replacing PUT with GET and changing filepath to an existing file) works.

Via the Sharepoint Web interface I can upload new files. I have also tried changing the authorization in the parameters to put Full Control for all Authentified Users on this directory.