Rename Directory Folder if does not already exist - Help!!!

I have the following script - which identifies folders in a directory and renames a folder if it meets a certain criteria - specifically, if the folder name consists of 5 total characters in length.  If it locates the folder that meets this criteria the script will prefix the folder name with a "5" - as all my folders must consist of 6 total characters in length.  

That being said, it appears that some yahoo went ahead and renamed more than a few to 6 total charcters by hand (meaning they took a folder such as "XXXXX" and manually renamed it as "5XXXXX" - now my script is telling me that when it gets to "XXXXX" it cannot rename it to "5XXXXX" as the folder already exists - which brings me to my question - can I identify and exclude such instances so that they are just skipped in the script below:

      private void Button3_Click(object sender, System.EventArgs e)
            {
                  string path = "\\\\dadt01\\dadoc01\\DOCS\\Dallas\\"; //just for an example I use temp

                  string[] dirs = Directory.GetDirectories(path); //retrieve the directories in the given folder

                  foreach (string dir in dirs)  //look at each of those directories
                  {
                        // Get just the directory name by stripping the c:\\temp\ or whatever happens to be there
                        string dirname = dir.Substring(dir.LastIndexOf("\\") + 1);
                        // if it is less than 6 then call the Directory.Move, which renames the folder, with the old location and the new
                        // location
                        if (dirname.Length == 5)
                        {
                              Directory.Move(dir,
                                    dir.Substring(0, dir.LastIndexOf("\\") + 1) + "5" + dirname);
                        }
                  }
                  lbl3.Text = "Complete";

tbaseflugAsked:
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tzxie2000Connect With a Mentor Commented:
you can use Directory.Exists to test whether the directory is exist

like code below:
private void Button3_Click(object sender, System.EventArgs e)
          {
               string path = "\\\\dadt01\\dadoc01\\DOCS\\Dallas\\"; //just for an example I use temp

               string[] dirs = Directory.GetDirectories(path); //retrieve the directories in the given folder

               foreach (string dir in dirs)  //look at each of those directories
               {
                    // Get just the directory name by stripping the c:\\temp\ or whatever happens to be there
                    string dirname = dir.Substring(dir.LastIndexOf("\\") + 1);
                    // if it is less than 6 then call the Directory.Move, which renames the folder, with the old location and the new
                    // location
                    if (dirname.Length == 5)
                    {
                         if(!Directory.Exists(dir.Substring(0, dir.LastIndexOf("\\") + 1) + "5" + dirname))//<----test whether the move to direcotry is exists,if exists do not move the directory
                         Directory.Move(dir,
                              dir.Substring(0, dir.LastIndexOf("\\") + 1) + "5" + dirname);
                    }
               }
               lbl3.Text = "Complete";
}
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tbaseflugAuthor Commented:
tzxie2000 -

Thanks giving it a shot now.
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tzxie2000Commented:
then could this solve your problem?
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