asp.net - how to get the size of image that bind dynamically -

i have image likes ,

    <img runat="server" id="myimage"/> 

and load source of image @ start of page ,

clsdb db = new clsdb(); protected void page_load(object sender, eventargs e) {     if (!ispostback)     {         var obj = db.context.images.where(x => x.id ==             int32.parse(request.querystring["id"])).singleordefault();         myimage.src = obj.imagepath;     } } 

i want original size (by px) of image . how can ?

save them database along url, select , return page. alternatively can use techniques question dimensions via javascript.

javascript: image dimensions