JsonP implementation in a webservice

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C#

C#4.0

Hi,
I want to implement JSONP in my web service.. A request will be coming to webservice and My service sends the Json string to the caller. Now I am asked to implement JsonP . While I am browsing google i came to understand that JsonP meaning "Padding" and the CallBack keyword will be appended to the output string.

Example :
http://www.somedomain.com/TokenGenerator.aspx?callback=?SampleName


So I have a serious question that how can the recivier web service geths the CallBack value which is given by the caller"?


Please give a solution... I dont know how to get the url dyncamically to read the callback funtion in my webservie? Note: This is not a asp.net web application, its a webservice