creating subdomain in asp.net dynamically

Hi everyone I have one problem i have on website with name theweddingstore.ie now i have done url rewritting for this website but now we want to make "http://www.theweddingstore.ie/prakash" to "http://www.prakash.theweddingstore.ie".I can't start how to make it and i am totally confuse any anyone  guide me and i have dedicate server.
Regards Prakash
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