<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="addType()" />



    <script type="text/javascript" >

        function addType() {

            var getType = prompt("Please input Type", '');

            if (getType!=null) {

                var XmlHttp = createXMLHttpResponse(); 

                if (XmlHttp) { 

                    XmlHttp.onreadystatechange = interactWithServer(XmlHttp); 

                    XmlHttp.open("GET", " interactWithAJAX.aspx?action=addType&type=" + getType,true); 

                    XmlHttp.send();

                }

                else {

                    alert("XMLHttpResponse is null");

                }

            }

            else {

                alert("Type not be save");

            }

        }

        

        function createXMLHttpResponse (){ 

            if(window.ActiveXObject )

                return new ActiveXObject("Microsoft.XMLHTTP");

            else(window.XMLHttpRequest)

                return new XMLHttpRequest();