Directoryinfo from URL

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ASP.NET

WebForms

C#7.0

Hi all,

I have a TreeView to List contents of a directory. The directory/folder locates on the same server the website is hosted. It is working very well.
I'm trying to list the contents of a directory from external URL.
I have tried many ways and all gives error

URI formats are not supported

which makes sense.
I want to know what is the best way to list contents of URL folder if possible. If not possible is there an alternative solution?
I'm using asp.net webforms.

Thanks in advance
Samira

What I have tried:

My code to browse folder on the webserver:

DirectoryInfo rootInfo = new DirectoryInfo(@"\\10.0.0.8\d$\f1\webApp\apps");
            int directoryCount = rootInfo.GetDirectories().Length;
            Docs_treeView.Nodes.Clear();
            //if there's sub-direcotries under the selected directory to list
            if (directoryCount > 0)
            {
                this.PopulateTreeView_WithDirectories(rootInfo, Docs_treeView, null);
            }
            else
            {
                //just populate only files 
                this.PopulateTreeView_WithFiles(rootInfo, Docs_treeView, null);
            }

Trying to replace

DirectoryInfo rootInfo = new DirectoryInfo(@"\\10.0.0.8\d$\f1\webApp\apps");

with

DirectoryInfo rootInfo = new DirectoryInfo(@"https://abc/f1/webApp/apps");