Ajax AutoComplete with Inner Join in ASP.Net

Hello friends I have a problem. I take clients through TextBox AutoComplete Ajax. But here when I want also want to attract customers, also that which users belong to this customer. How is this possible. I share code. Can anyone help me please. 

 Here I get data with İnner Join. 

//string sql = string.Format("SELECT Title,Name FROM Customer LEFT JOIN User As T3 ON T3.Id = Customer.IdSaler WHERE Title like '%{0}%' Order BY Title LIMIT 10", text);

Here is Html Page Ajax Code

<script>
        $(function () {
            $("#txtCustomer").autocomplete({
                minLength: 3,
                source: function (request, response) {
                    $.ajax({
                        url: "API.ashx",
                        data: 'Token=GetCustomersForAutoComplete&Param1=' + request.term,
                        dataType: "json",
                        success: function (data) {
                            response(data);
                        }
                    });
                },
                select: function (event, ui) {
                    $("#txtCustomer").val(ui.item.Title);
                    $("#hdnCustomer").val(ui.item.CustomerId);
                    return false;
                }
            }).autocomplete("instance")._renderItem = function (ul, item) {
                return $("<li>").append(item.Title).appendTo(ul);
            };
        });
    </script>