Then, as Askimet gave me error at my new URL, I had to re-enter my WordPress API key again and save it in the Askimet Configuration Page (Plugins>Askimet Configuration) to solve it. Also, I had to re-enter api-key at WordPress.com Stats Plugin Configuration (Plugins>Wordpress.com Stats). It also provided me option to replace my blog with the new one in WordPress Dashboard.
Now, i wanted the older domain and older links to point to my current domain. For this, I replaced the .htaccess in the old site directory with new one as mentioned here.