How can I pass data from an ActiveX control displaying at the client browser to the server.

As I know OCX runds on client side, so how can it communicate with the server ??

Any suggestion would be appreciated.

You need to introduce events/callbacks into your component. Check out the coffee project example on MSDN

You can also use post using xml to a backend message router. such as:

set xmlHttp = server.CreateObject("MSXML2.xmlHttp")
    xmlHttp.Open "POST", "http://devmessagertr:190/router.aspx", False
    xmlHttp.setRequestHeader "Content-type", "application/xml"
    xmlHttp.send strGatewayXML
    retval = xmlHttp.Status
    if retval > 199 and retval < 203 then
        Response.Status = "202 OK"
    else
        response.status = "406 Not Acceptable"
    end if

where strGatewayXML is your xml