jquery - How can I keep all html in session with webservice? -

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i want keep full html in page in session using webservice set session step throw exception.

object reference not set instance of object.

my functions 

[webmethod(description = "gsetsession")] [scriptmethod(usehttpget = false)] public void setsession(string html) {     httpcontext.current.session["html"] = html; }  [webmethod(description = "getsession")] [scriptmethod(usehttpget = false)] public string getsession() {     if (httpcontext.current.session["html"] != null)     {         return httpcontext.current.session["html"].tostring();     }     else      {         return "";     } }

in web methods, make sure enable session

[ webmethod(description="get session",enablesession=true)]

reference


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