Hi! Kindly tell me that which is the best tool to create xml sitemap of website. Do you use any tool to create the sitemap of your website

There are lots of online tools available on the net. You can choose any of then according to your site.

If you need something of commercial grade quality, try A1 Sitemap Generator (30 days trial)

This forum also has the official support board for A1SG (although you can also email if you prefer)