FolderExtension.cs

        /// <summary>
        /// 
        /// </summary>
        /// <param name="destinationPath"></param>
        /// <param name="sourcePath"></param>
        /// <returns></returns>
        public static bool CheckDestinationPathCorrectness(this string destinationPath, string sourcePath)
        {
            var isValidPath = default(bool);

            // Condition 1
            if (destinationPath.Contains(sourcePath))
            {
                isValidPath = false;
            }
            else
            {
                isValidPath = true;
            }

            // Condition 2
            if (sourcePath == destinationPath)
            {
                isValidPath = false;
            }
            else
            {
                isValidPath = true;
            }

            // Condition 3
            var parentUri = new Uri(sourcePath);
            var childUri = new Uri(destinationPath);

            if (parentUri.IsBaseOf(childUri))
            {
                isValidPath = false;
            }
            else
            {
                isValidPath = true;
            }

            return isValidPath;
        }