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Krishna,
Have a look at the MSDN documentation on Network Policy Server -> Server Data Objects: http://msdn2.microsoft.com/en-us/library/bb960722(VS.85).aspx
There are examples of how to add RADIUS clients on there (http://msdn2.microsoft.com/en-us/library/bb960606(VS.85).aspx and http://msdn2.microsoft.com/en-us/library/bb960607(VS.85).aspx) as well as how to perform other SDO tasks.
Thanks,
-Matt McKenzie