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Editorial Team
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Asked: 2026-06-05T17:46:04+00:00

I am using ASP.NET for my web application. I am able to write a

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I am using ASP.NET for my web application. I am able to write a text file in server path using this method Server.MapPath(). But I also want to create a text file in different location like C:\ or D:\. I am using IIS version 5.1.

This is my code to write a file in the C:\ drive.

    string text="Welcome";
    StreamWriter sw = new StreamWriter("C:\\sample.txt", true);
    sw.WriteLine(text);
    sw.Close();

When I run the application it throws a runtime exception saying

UnauthorizedAccessException. Access to Path C:\sample.txt is denied.

Please guide me how to write a text file in the C:\ drive…

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  1. Editorial Team

    Its obvious that you need permission to be able to create/write/delete etc a file on any location on disk.

    The tip here is that your asp.net application is running under one pool, and the pool is running under specific user – this user must have the correct permissions.

    Update

    There is two kind of users that “runs” together on an asp.net page. The one have to do with permission with IIS, and this is the one that KBoek speak about. For example, a user request a page , from IIS, and the IIS using the USER A to see if can read this file and send it back to web – or have permissions to run.

    The second type of user is the pool. From the moment that IIS have permissions to run the pool then run it using the pool user. So if the file is going to read by pool the pool must have permission to read and not the iis.

    Why there are two kind of users here. Because the one is represent the user that see the data, and the other represent the programming that we made.

    If for example we have an automation tool that make delete to a set of files, then we do not won to the remote client to direct access this file and maybe delete if he like to – but only we must have this permission to do only on programming. So our asp.net program have different permissions from the user that connect and see page, so we have two kind of users here.

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