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Access Denied in .NET writing file to file share

I have a web service that is trying to write a file to a file share.
The application pool for the site in iis is running as a custom domain account: "domain\domainaccount"
I'm operating under the assumption and hope that when the code tries to write the file it will use the "domain\domainaccount" user to do so.
Executing the following line of code produces the error: Access to the path [filename] is denied
FileStream stream = File.Create(fileName, result.Length);
I have confirmed that the "domain\domainaccount" account has access to [filename] which is the full path of the file including the file name. I have even given the account access from the very top of the share structure, not just the specific folder the file needs to be written to. In fact, if I run notepad as "domain\domainaccount" I can save a file to that exact location.
What might I be doing incorrectly? Is it not using the domain account to write the file? If not, can I change something so that it does?
I should note that if I log into the iis server and run the web service from there, I do not get the access denied message and the file is created.

Check if file from remote server exists

i have an application which requires access permission to a file on remote server.
My app is in Server A, and the file i want to access is in Server B. These 2 servers are in the same domain.
I created a virtual directory in Server A for the directory in Server B. The name of virtual directory is FolderFromServerB and its path is \ServerB\Folder. I use a user for auth, and when i test the connection in IIS it says all is OK.
Also, when i put an anchor tag in a test file like below, i can access the file and the content is shown in the page:
Test file --> **This works**
But my problem is when i use code in order to if that file exists or not, it always returns with False. My code is like below:
FileInfo fi = new FileInfo(#"\FolderFromServerB/test.txt"); --> This doesn't work
Response.Write(fi.Exists); --> This always 'False'
I granted 'Full Control' permission to my user& NETWORK SERVICE & Everyone & Administratos in Server B but i didnt work neither.
How can i make it work?
It was working last week. I guess the server updated itself and some updates made that occur, but i couldn't find any workaround. Im so desperate now and i have to change all of my code and spend much time to make it work.

I found the workaround that is in web.config :
<identity impersonate="true" userName="{domain}\{username}" password="{password}"/>
I used File.Exist() for a few months, but then suddenly it was gone and didnt work, and i dont know why. But it is the solution above.

Your code does not work because the current execution folder of an ASP.Net application is not the folder of you application, but c:\windows\system32.
When you create the FileInfo object, you will try to read c:\windows\system32\FolderFromServerB\test.txt.
The <a href="FolderFromServerB/test.txt"> works because the link will be relative to the current page (it won't works if the page is in another directory).
If the file you are looking for is under your application directory, you can convert a virtual to a physical path using :
string actualFilePath = HttpContext.Current.Server.MapPath("~/FolderFromServerB/test.txt");
FileInfo fi = new FileInfo(actualFilePath);

I can copy a file, but my C# console app can't

I've written a console app to help load code to servers, but I'm running into an issue running it. I'm getting a "System.UnauthorizedAccessException: Access to the path '\...' is denied.
The app is comparing files, and those that are different it copies from a staging area to the server. It runs fine until I try to copy, then I get this error (e.g. I can read and compare the files, but not modify them). If I (manually) simply copy a file from one area to the other, no issues.
I was under the impression that a console app runs as the person who executes it.
The offending code is this:
File.Copy("correct staging path", "correct live path", true);
I was able to verify that the application is running as me using:
Environment.UserName (WindowsIdentity.GetCurrent().Name shows the same)
The destination path is a network share (e.g. \\servername\path)

How to create a Text file and save it to a shared-directory?

I'm having an issue here, I developed an application in C# which creates a text file. This text file is saved in the X:\Public\3rd\ASN\, the problem is that in development the files are created and saved with no issues but once I move the application into our Web Server the appplication fails and it throws out this error "Could not find a part of the path X:\Public\3rd\ASN\1175_0001.txt".
This is the code I'm using to saved the file in the directory:
w = File.CreateText("X:\Public\Public\3rd\ASN\1175ASN_0001.txt");
Keep in mind that this directory is another server.
Any help will be really appreciate it.

your X drive is a mapped network drive. You need to use the network url eg \\server\directory\Public\3rd\ASN\1175_0001.txt

How to upload files on server?

I have deployed my software on a server,In my software there is a tool which reads an excel file and displays the content in a gridView.
It's working fine on my stand-alone PC, how can I do it on the web?
Should I upload my excel files on server and then read it or directly read it from the user's PC?
Any solutions?

you need to put fileupload control on your page
<asp:FileUpload ID="fup" runat="server" />
and then in code behind, save this file
fup.SaveAs(Server.MapPath("~/upload/temp/" + fup.FileName ));
you can take a look at this article
Performing a File Upload using ASP.NET 2.0 and C# .NET
and Simple File Upload Control with ASP.NET and C#

I am not getting your question so far.Which error occurs on web?
Here is the sample code which may help you.
Every time it uploads excel file on server from client machine and get data from that and bind grid.
protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
if (AsyncFileUpload1.HasFile)
{
string strPath = MapPath("~/Uploads/") + System.IO.Path.GetFileName(e.filename);
// gets extension of a file to check for a valid excel file
string ext = System.IO.Path.GetExtension(e.filename);
if (ext.ToLower() == ".xlsx" || ext.ToLower() == ".xls")
{
AsyncFileUpload1.SaveAs(strPath);
}
DataTable dt = getdata(strPath); // get data from excel file
BindGrid(dt);
}
}

You can't read it directly from users PC, you need to upload files anyway.

It's working fine on your local environment because effectively your website and the file you're trying to read are on the same machine. As a result, the web server can just load the file directly and there's no problem.
In a live environment, the website will be on a server somewhere while the excel file will be on the user's on own pc. In this scenario the web server can't access the file and you will have to upload to the web server by means of a file upload dialog. You can then save this file to a safe folder you specify (ideally in your web.config in case you change your mind or need to move it) somewhere on your server and access the file to display, manipulate or even insert into a database should you choose to.

I don't think you should save it to your server unless you really have to (which would require Write permissions on the directory you save to). If you are using Open XML to read the Excel file you can read the posted stream directly without saving to file first via SpreadsheetDocument.Open(FileUpload1.PostedFile.InputStream, false)...