System.UnauthorizedAccessException Access to the path is denied

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Posted on by Faqruddin

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Dear All,

I have a requirement to write a file on local disk C. I use following code but it's failed to create a file and throws error access denied. I granted folder permissions full control but no luck. Please advice further.

        str filepath = "";
        Set    permissionSet = new set(types::Class);
        filepath = @"C:\test\test.txt";
        System.Text.Encoding encoding = new System.Text.UTF8Encoding(false); 
        permissionSet.add(new FileIOPermission(filepath, 'rw'));
        permissionSet.add(new InteropPermission(InteropKind::ClrInterop));
        CodeAccessPermission::revertAssert();
        CodeAccessPermission::assertMultiple(permissionSet);
       // WinAPIServer::createFile(filepath); not works same error
        System.IO.File::WriteAllText(filepath, "Data 123", encoding);
        CodeAccessPermission::revertAssert();
        info('done');

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Mohamed Amine Mahmoudi 26,294 Super User 2025 Season 2 on at

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System.UnauthorizedAccessException Access to the path is denied

Hi @Faqruddin

I think you can use BusinessEvent and power automate to store the file in local disc using on-premises data gateway connector.

Best regards,

Mohamed Amine MAHMOUDI

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Anthony Blake 2,617 Super User 2025 Season 2 on at

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System.UnauthorizedAccessException Access to the path is denied

Sure, there's one here for Azure blob: https://community.dynamics.com/blogs/post/?postid=559fc21f-9349-46b0-8c46-42d70d7c292c

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Faqruddin 1,881 on at

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System.UnauthorizedAccessException Access to the path is denied

Thank you for your responses. Please any X++ code examples to write to cloud storage?

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Anthony Blake 2,617 Super User 2025 Season 2 on at

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System.UnauthorizedAccessException Access to the path is denied

For more info take a look at this thread:

https://community.dynamics.com/forums/thread/details/?threadid=0ef3316f-aaff-492e-9282-863fc21a9d77

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Anthony Blake 2,617 Super User 2025 Season 2 on at

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System.UnauthorizedAccessException Access to the path is denied

Hi Faqruddin,

As Finance is a cloud solution, you cannot access your C drive via code.

There are a number of patterns you can explore instead, you could present the file to the user for download in the browser when ready, or write it to cloud storage.

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