Hello Srinivasa Rao Ranga,
The reason for this postback is because the navigation triggered on nodeClick event. The way a masterPage works is fairly different that one could expect (including me in this number):
- Instead updating only the content place holder, navigating to different content pages, makes a full navigate (merge between master and requested page) like opening a new page.
In order to achieve the smooth update that you want here you probably will not use a masterpage. You can use a regular page in which you can update some placeHolder (again through updatePanel or better through our RadAjaxManager, using server-side code to change the content in this placeHolder).
Also there is another solution that comes in mind - you can use an iFrame, but then the placeholder will be full page.
Hope this is helpful for you!
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