(C#) Create folders if not exist

        private void createDirs(string str)
        {
            string[] dirs = str.Split('\\');
            string new_str = String.Empty;

            foreach (string dir in dirs)
            {
                new_str += dir + "\\";
                if (Directory.Exists(new_str) == false)
                {
                    try
                    {
                        Directory.CreateDirectory(new_str);
                    }
                    catch (Exception ex)
                    {
                        MessageBox.Show(ex.ToString(), "Error creating directories");
                    }
                }
            }
        }