asp.net - how to create JSON webservice, can Anyone refer any tutorial for this -

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i cant able find out correct soltion . our client android , iphone. need create webservice these 2 client. dont know single step this. please 1 refer tutorial website or guide me.i using .asmx form.and use c#

at high level, simple. instead of returning html code in response http or post, return json string. real question how create json string object want send.

there several libraries can take object , return json string. in python can use 

return simplejson.dumps(<<object name>>)

in php, 

echo json_encode(<<object name>>);

which language using?


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