Open Folder and Select multiple files

In C# I want to open explorer and in this explorer window must be selected some files. I do this like that:

        string fPath = newShabonFilePath;

        string arg = @"/select, ";

        int cnt = filePathes.Count;
        foreach (string s in filePathes)
        {
            if(cnt == 1)
                arg = arg + s;
            else
            {
                arg = arg + s + ",";
            }
            cnt--;
        }

        System.Diagnostics.Proce开发者_运维知识库ss.Start("explorer.exe", arg);

But only the last file of "arg" is selected. How to make that all files of arg would be selected, when explorer window is opened..? I think its possible to do that, becouse I have seen many Windows app programs, which have this trick. In example, when I import pictures from my DSLR camera to the pc, finally apears windows explorer and all the new imported images are selected.

Maybe there is some option, to make all files to be selected from specified folder..?

explorer.exe /select only takes 1 argument. From KB 314853:

/select, Opens a window view with the specified folder, file, or program selected.

Could you launch each file in the loop?

foreach (string s in filePaths)
    System.Diagnostics.Process.Start("explorer.exe", "/select, "+s);

P.S. string.Join is a greatly underused feature of .NET