restful wcf service post method reponse in json format

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ASP.NET

WCF

http://localhost:8005/Service1.svc/AddData

And i need to return data (output) like below,

Condition 1: If both saved in db without any error,

{"sjSonData":[{
  "success":true
}]}

Condition 2: Suppose any one data failed to save in database then

{"sjSonData":[
{
"log_Id":1,
"success":false
},
{
 "log_Id":2,
 "success":true
}
]}