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I have utility to rename a file in a specified directory using a certain condition. Running the code using a console application works well and the file is renamed appropriatelty. However when i attempt the same in a web application the file is not getting renamed. I am using VS2017 Development Server for the web application debug.

What am i missing?

Using the console application code as below the file successfully gets renamed :

Rename method:

public static string AddSuffix(string filename, string suffix)
           string fDir = Path.GetDirectoryName(filename);
           string fName = Path.GetFileNameWithoutExtension(filename);
           string fExt = Path.GetExtension(filename);
           string renamedFilePath= Path.Combine(fDir, String.Concat(fName, suffix, fExt));
           return renamedFilePath;

Usage in working main program:

<pre>static void Main(string[] args)
		 string batchperiod = "_70_";
            string realPath = @"C:\Users\myuser\source\repos\Solution\Project\BatchIn";
            IEnumerable<string> fileList = Directory.EnumerateFiles(realPath);

            var CurrentBatchName = (from file in fileList
                                    let fileName = Path.GetFileName(file)
                                    where fileName.Contains(batchperiod)
                                    select fileName).FirstOrDefault();

            string absolutePath = (@"C:\Users\myuser\source\repos\Solution\Project\BatchIn\" + CurrentBatchName);
            string newPath = Helpers.AddSuffix(absolutePath, String.Format("({0})", Helpers.parameters.IsProcessed));
            System.IO.FileInfo fi = new System.IO.FileInfo(absolutePath);
            if (fi.Exists)


With this code the file is successfully renamed from

The only difference using web application is that the absolutePath is stored in a Session variable having been derived from a preceding operation/ActionResult :

var absolutePath = (@"C:\Users\myuser\source\repos\Solution\Project\BatchIn\" + CurrentBatchName);
                   files.FileName = CurrentBatchName;
                   Session["AbsoluteBatchPath"] = absolutePath;

and later invoked in another ActionResult as :
var sourceFile = Convert.ToString(Session["AbsoluteBatchPath"]);
                string newPath = AddSuffix(sourceFile, String.Format("({0})", parameters.IsProcessed));
                System.IO.FileInfo fi = new System.IO.FileInfo(sourceFile);
                if (fi.Exists)
                    // Move file with a new name. Hence renamed. 

What I have tried:

I have tried using File Move variant but it cannot work with FileInfo class. Anyone to help on why the function is not working in the web application. I suspect it might have something to do with IISExpess that runs with Visual Studio.

Are there any permissions i need to alter at IISExpress level.
Updated 29-Jan-20 0:47am
Richard MacCutchan 22-Jan-20 4:04am    
You are not allowed to change anything in the client from a browser. Would you like to go to a website that can rename files at will on your system?
Tshumore 22-Jan-20 4:49am    
Ok i get it. So what permissions do i need to change, in which folder, to enable this
Richard MacCutchan 23-Jan-20 4:24am    
Read my comment again: browsers are not allowed to change anything on the user's system.
_Asif_ 22-Jan-20 6:37am    
You probably need to give full access rights to IIS_IUSRS User
Gerry Schmitz 22-Jan-20 13:15pm    
Why are you accessing (windows) "user" files on the server? Web applications use "application data" (folders) and / or data bases.

1 solution

I'd strongly recommend to read this: Development-time IIS support in Visual Studio for ASP.NET Core | Microsoft Docs[^] and this: Publish to IIS by importing publish settings - Visual Studio | Microsoft Docs[^]

You need to understand (what has been already stated in the comments) that accessig files in design mode and "production" mode is totally different.
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