Call Code behind method from javascript

Use this

function CallBackRequest(url,params,Callback)
{
    var xmlHttp;
    try
    {  
      // Firefox, Opera 8.0+, Safari
      xmlHttp=new XMLHttpRequest();
    }
    catch (e)
    {
      // Internet Explorer
      try
      {
        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
      catch (e)
      {
        try
        {
          xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        catch (e)
        {
          alert("Your browser does not support AJAX!");
          return false;
        }
      }
    }
    xmlHttp.onreadystatechange=function()
    {
      if(xmlHttp.readyState==4)
        Callback(xmlHttp.responseText);
    }
    if(params== null)
    {
      xmlHttp.open("GET",url,true);
      xmlHttp.send(null);
    }
    else
    {
      xmlHttp.open("POST",url,true);
      xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
      xmlHttp.setRequestHeader("Content-length", params.length);
      xmlHttp.setRequestHeader("Connection", "close");
      xmlHttp.send(params);
    }
}

you may use _doPostBack method to execute server side event..like

__doPostBack('ButtonID','')
// if you are using master page than use <%= ButtonID.ClientID %>

for more info

http://wiki.asp.net/page.aspx/1082/dopostback-function/

You can use XML http for it ,it's goes in to server and do what ever you want....

Hi All

I found solution, code behind method can be called from java script but using web methods