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    <p>The intent of your question is still not clear.</p> <p>Are you...</p> <p>A. trying to connect to a web application (hosted with IIS) from a client browser and access a file from a network share (relative to the server) for the client to consume?</p> <p>B. trying to connect to a web application (hosted with IIS) from a client browser and have the application access a file from the network to be used by the server (like a .txt file containing information that the application needs for some processing)?</p> <p>C. trying to connect to a web application (hosted with IIS) from a client browser and have the hosted application access a file from a network share (relative to the client) for the server to consume?</p> <p>My assumption is you are attempting (B) and if so, you should use System.IO and access your files programmatically instead of trying to launch a process.</p> <p><strong>UPDATED BELOW</strong></p> <p>If you are trying to connect to a web application, and launch a local process (such as notepad.exe) on the client you cannot do so by launching a process. Otherwise MyVirus.com could launch local processes on my machine and that would be a nightmare. The web application is only going to launch processes on the server, never the client.</p> <p>The best you can do is open the file (from the server) and send a Response back to the client with the contents of the file or send the path and file name to the client and open it via javascript or an <a href="http://blog.teamtreehouse.com/reading-files-using-the-html5-filereader-api" rel="nofollow">HTML5 FileReader</a>.</p> <p><strong>ADDITIONAL UPDATE</strong></p> <p>You should be able to open an image (or other content consumable in a browser) from a UNC path as long as you are your Application Pool Identity has permissions and also, are you using impersonation (identity impersonate="true" userName="someaccount" password="somepassword")?</p> <p><strong>ONE LAST UPDATE</strong></p> <p>Unfortunately even opening a folder location requires a local process to launch (explorer.exe). That's simply not going to happen with modern browsers for security reasons. You could cook up something wonky like a local windows service on each client machine that checks a database and if it finds x it launches the local explorer.exe to the path stored in the database... but it would have to be checking every second and that sounds like a really bad idea. </p> <p>Other than that maybe something like this <a href="http://www.telerik.com/products/aspnet-ajax/fileexplorer.aspx" rel="nofollow">File Explorer Control from Telerik</a> or this <a href="http://www.ssware.com/fileview/fileview.htm" rel="nofollow">File View Control</a> would serve your purposes. (Disclaimer, I don't know anything about either of these controls just thought they might help).</p>
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    1. POOpening a text file on the local system from an asp.net web application
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    1. COThanks for your response: I would go with C as my answer. My web application creates a folder structure on our file server, this structure is tied to information from the database. I want a user to be able to access a record in the web application and open the correct folder location on the file server. The client browser, web server and file server all run on the same network.
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    2. COSo from the client, you visit a website, and you are presented with a file path and you want the client to open a file (or launch notepad.exe) and access a file from that patch such as \\myserver\mypath\myfile.txt?
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    3. COPretty much, I have edited my original question to state that I want the user to be able to open a network folder. The users/web server/file server are all on the same domain.
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