special character in folder string here @

Question

I have been searching intensively, but the returning results are not quite what I am trying to achieve.
I want to access a remote folder on a server. The pain point comes (I assume) from the @ in the name of the folder name. And that @ with regards to folder name of course leads to the '\\' topic in all results I googled, which are not my issue, even though it probably is an 'illegal' character topic.
For Debugging I copy the content of the string rootFolderPath and pasted it into a browser / explorer it opens up, as it should (using in both cases the same windows UID).
The first example (in the comments) for rootFolderPath runs nicely without problems. The problem shows up in the System.IO.Directory.GetFiles line
The third example results in the same error, which is:

An unhandled exception of type 'System.IO.IOException' occurred in mscorlib.dll Additional information: The network path was not found.

What can I do to access that folder? I cannot change the name of the folder (as out of reach) unfortunately.

    //string rootFolderPath = "D:\\Data\\temp\\Debug\\";
    string rootFolderPath ="\\\\shareroom1.eu.test.de@SSL\\DavWWWRoot\\de\\itgqc\\Operational Slide Decks\\Public\\Server with Open Shares (Config Mgmnt)";
    // string rootFolderPath = @"\\shareroom1.eu.test.de@SSL\DavWWWRoot\de\itgqc\Operational Slide Decks\Public\Server with Open Shares (Config Mgmnt)";

    string filesToDelete = @"list_" + tower + "*.xlsx";   // Only delete XLSX files containing "list_" in their filenames

    string[] fileList = System.IO.Directory.GetFiles(rootFolderPath, filesToDelete); <---- here I get the error
     foreach (string file in fileList)
     {
       Console.WriteLine(file + " will be deleted");
       System.Diagnostics.Debug.WriteLine (file + " will be deleted");
       try
       {
        System.IO.File.Delete(file);
       }
        catch (IOException) 
        { log.Error("Could not delete " + file + " probably was blocked");}
      }

Environment: VS 2015 and .NET 4.6.1

Answer 1

I would use StringBuilder - and make the at sign a CHAR variable with the ASCII equivalent (don't have my green card handy right now)

StringBuilder sb = new StringBuilder();
sb.Append("\\\\shareroom1.eu.test.de")
sb.Append('@'); // replace with ASCII here if necessary
sb.Append("SSL\DavWWWRoot\de\itgqc\Operational Slide Decks\Public\Server with Open Shares (Config Mgmnt)");
rootFolderPath = sb.ToString();