score:0
try to delete 'static' keyword from method signature.
score:1
instead of returning json data, try to write the data and also tell the browser about data by sending header information like:
httpcontext.current.response.contenttype = "application/json";
httpcontext.current.response.addheader("content-encoding", "utf8");
httpcontext.current.response.write(returndata);
Source: stackoverflow.com
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