How can I send textbox and file upload data of a webform to webmethod using Jquery/Ajax call?

var dataToSend = new FormData();           
 dataToSend.append('file',  document.getElementById("myFile").value);
 dataToSend.append('text',  document.getElementById("biddername").value);

            $.ajax({
                type: "POST",
                url: "SupplierMaster.aspx/RegisterSupplier",
                data: dataToSend,
                processData: false,
                contentType: false,
                dataType: false,
                async: true,
                success: function (data, status) {
                    console.log("CallWM");
                    alert(data.d);
                },
                failure: function (data) {
                    alert(data.d);
                },
                error: function (data) {
                    alert(data.d);
                }
            });

        }

[WebMethod]
    public static string RegisterSupplier(HttpPostedFile file, string biddername)
    {

        return "a";
    }