Rabindra,

If you're using NetAdvantage for .NET 2009 Volume 1 or 2009 Volume 2, the SDK (now simply called the "Samples") are a separate installer that is included with the downloaded bundle of either NetAdvantage for Win Client: Windows Forms or NetAdvantage for Web Client: ASP.NET.

If you're using an earlier version of the toolset, the SDK is a separate download that you can access from the My Keys and Downloads page of our website, assuming that you have a registered license key for the corresponding verison.

For even-older versions of the toolset, the samples were installed along with the product.  I don't immediately recall when that change was made.  I can find this information if it becomes important to you or to someone else.