wcf json webservices asp.net

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ASP.NET

webservice

sir i want to create json wcf webservice in asp.net...sir iwant to insert data from wcf webservice which has to be consumed by iphone app for page create account...in wcf webservice i want to create message after writing insert query then pass a string reult message that is "record insert successfuly" this message should be created in json wcf webservice asp.net...so can u please tell me the code for this..i have created a databse on window server but i'm left with insert data through json wcf webservice....please help me sir i stuck since from 2 months.....i really thankfull to uuu....