Move directory one volume drive to other volume drive

public void MoveDirectory(string strSrcDir,string strDestDir,bool isOverRide)
        {
            if (Directory.Exists(strSrcDir))
            {
                if (Directory.GetDirectoryRoot(strSrcDir) == Directory.GetDirectoryRoot(strDestDir))
                {
                    Directory.Move(strSrcDir, strDestDir);
                }
                else
                {
                    try
                    {
                        CopyDirectory(new DirectoryInfo(strSourceDir),new DirectoryInfo(strDestDir));
                        if (isOverRide)Directory.Delete(strSo­ urceDir, true);
                    }
                    catch (Exception subEx)
                    {
                        throw subEx;
                    }
                }
            }
        }

        private void CopyDirectory(DirectoryInfo diSrc,DirectoryInfo diDest)
        {
            if (!diDest.Exists)diDest.Create();­ 
            FileInfo[] fiSrcFiles = diSrc.GetFiles();
            foreach (FileInfo fiSrcFile in fiSrcFiles)
            {
                fiSrcFile.CopyTo(Path.Combine(diDe­ stDir.FullName, fiSrcFile.Name));
            }
            DirectoryInfo[] diSrcDirectories = diSrc.GetDirectories();
            foreach (DirectoryInfo diSrcDirectory in diSrcDirectories)
            {
                CopyDirectory(diSrcDirectory, new DirectoryInfo(Path.Combine(diDest.FullName, diSrcDirectory.Name)));
            }
        }