can anyone give me the full project containing the code as well for getting host ip address using DHCP.I am using real view MDK ARM version 3.50
Keil is _selling_ the code for networking for ARM chips. You must either buy that Keil library or look for thirdparty alternatives.
There are very many of those - both commercial paid-for ones, and free open-source.
Some are mentioned here: http://www.keil.com/tcpip/links.asp
Chip suppliers often have a "special deal" with one or more 3rd-party providers...
Or, if you really want someone to do it all for you, see: http://www.keil.com/condb