CheckFolderNamesForSP.cs

 /// <summary>
        /// Folder Name (For Preparing Folders to be Moved to SharePoint)
        /// You cannot use the following characters anywhere in a folder name or a server name:  ~ # % & * { } \ : < > ? / | "
        /// Cannot be longer than 128 characters
        /// You cannot use the period character consecutively in the middle of a folder name
        /// You cannot use the period character at the end of a folder name
        /// You cannot start a folder name with the period character
        /// </summary>
        /// <param name="folderName">vomit</param>
        /// <returns>vomit</returns>
        public static string CleanFileFolderName(string folderName) 
        {
            //take out all wierd characters in the names that sharepoint/windows would vomit on.
            folderName = folderName
                .Replace("", "")
                .Replace("\"", "")
                .Replace("#", "")
                .Replace("%*", "")
                .Replace("&", "and")
                .Replace("*", "")
                .Replace("<", "")
                .Replace(">", "")
                .Replace("?", "")
                .Replace("\\", "")
                .Replace("/", "")
                .Replace("{", "")
                .Replace("|", "")
                .Replace("}", "")
                .Replace("~", "")
                .Replace("..", "."); //cannot use the period character consectively in the middle of a folder name

            if (folderName.StartsWith("."))
                folderName = folderName.Replace(folderName.Substring(0, 1), folderName); //you cannot start a folder with the period character

            if (folderName.EndsWith("."))
                folderName = folderName.Replace(folderName.Substring(folderName.Length, 1), folderName); //you cannot end a folder with the period character
            
            int largestSubFolderLength = 21;
            
            if (folderName.Length > 128 - largestSubFolderLength)
                folderName = folderName.Substring(0, 128 - largestSubFolderLength);
            int count = folderName.Length;

            return folderName;
        }