var queryBuilder = new Sys.Data.QueryBuilder("Course");  

<%@ Page Title="" Language="C#" MasterPageFile="~/Master/AjaxClient.Master" AutoEventWireup="true" CodeBehind="QueryBuilder.aspx.cs" Inherits="DataServiceAjaxClient.QueryBuilder.QueryBuilder" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">

    <label>Insert Credits to filter the results:</label><br />

    <label>Credits:</label><input id="txtCredits" type="text" /><br/>

    <input id="ButtonQuery" type="button" value="Perform Courses Query" onclick="doQuery()" /><br />

    <br />

    <span id="spanResults"></span>

    <script type="text/javascript">

        function doQuery() {

            var queryBuilder = new Sys.Data.QueryBuilder("Course");           

            // set the filters if neccesery            

            queryBuilder.set_filter(buildFilter("txtCredits", "Credits eq "));

            // set the order by the title

            queryBuilder.set_orderby("Title");

            // perform the query itself

            proxy.query(queryBuilder.toString(), onSuccess, onFailure);                                  

        }

        function buildFilter(txtName, query) {

            debugger;

            var txt = $get(txtName);

            if (txt.value != null && txt.value != '')

            {

                return query + txt.value;

            }

            return '';

        }

        function onFailure(error, context, operation) {

            $get("spanResults").innerHTML =

               BuildErrorString(error, operation);

        }

        function BuildErrorString(error, operation) {

            var sb = new Sys.StringBuilder("Error occurred while performing operation ");

            sb.append(operation);

            sb.append("!");

            return sb.toString();

        }

        function onSuccess(result, context, operation) {

            var spanResults = $get("spanResults");

            spanResults.innerHTML = '';

            // Get Customers list and render by using an HTML table.

            var sb = new Sys.StringBuilder();

            sb.append("<table cellpadding='1' cellspacing='1' border='1' bordercolor='green'>");

            var firstRowOutput = false;

            for (index in result) {

                var course = result[index];

                // If this is first row write the table header

                if (!firstRowOutput) {

                    sb.append("<tr>");

                    for (key in course) {

                        if (key != "__metadata") {

                            sb.append("<th>");

                            sb.append(key);

                            sb.append("</th>");

                        }

                    }

                    sb.append("</tr>");

                    firstRowOutput = true;

                }

                // Display the data.

                sb.append("<tr>");

                for (key in course) {

                    if (key != "__metadata") {

                        sb.append("<td>");

                        sb.append(course[key]);

                        sb.append("</td>");

                    }

                }

                sb.append("</tr>");

            }

            sb.append("</table>");

            spanResults.innerHTML = sb.toString();

        }

    </script>

</asp:Content>