how to create web service with request and responce in josn?

Dear all,

 

i want create a web service that will send the data and recives the data in json,

 when i was create a web service it will autometically tacking soap formatt for post operation please expline me how to pass data in json formatt using sql stored procedures .please help me . 

 

my operation like bellow

 

[webmethod]

public string savedata(string name,string city,string country ,string pin)

{

sqlconnection conn=new sqlconnection(connection object);

sqlcommand cmd=new sqlcommand("sp_register",conn);

cmd.commandtype=commandtype.stroredprocedure;

cmd.parameters.addwithvalue("@name",name);

cmd.parameters.addwithvalue("@city"city);

cmd.parameters.addwithvalue("@country"country);

} 

 

by defalut am getting post operation in soap formatt i need to change it into json please help me