如何以表格形式进行AJAX

I have created a form in ASP.NET using C#. Now I want to implement AJAX on it.

Click Here to see the form.

I have used a GridView to show the saved information. I have absolutely no idea what to do and from where to start. If someone could guide me how to do it...?

write "onClick" function like:

onClick="myClick()";

define this click in your js file like:

   function myClick(){
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
   if (this.readyState == 4 && this.status == 200) {
    document.getElementById("demo").innerHTML = this.responseText;
//to get response on the html
   }
  };
 xhttp.open("GET/post", "urltocall", true);
   xhttp.send();
}