how to send angularjs objects to a C # controller

good morning I am new with angular, I have problems to send an object of angularjs to controller C #, I could send a string but at the time of wanting to send an object send me error someone some suggestion the code is the following

controlledrangularjs

 ClaveTruper = "CTF-1/2";
                Descripcion = "Cinta de teflon 1/2";
                Precio ="$4"
                PrecioEspecial ="$2"
                PrecioFabrica ="$3"
                Xml = obj2.Xml;
                CapacidadGancho ="G30"
                CodigoProducto = "12520";
                var ntl = [ CodigoProducto, ClaveTruper, Descripcion, Precio, PrecioEspecial, PrecioFabrica, Xml, CapacidadGancho ];
               // debugger;
                ImprimirService.Impre(ntl)
                    .then(function (response) {
                        if (response.code = 100) {
                            //  $scope.skuis = "";
                            $scope.impri = response.data.Result;

                            // $scope.skuis = Json.parse(angular.toJson(response.data.Result));
                            // console.log($scope.skuis);
                            $scope.impri = angular.fromJson($scope.impre);
                            //console.log($scope.skuis);

                            $scope.apply;


                            }
                        }, function (err) { });

                    return $scope.impri;

angular service

'use strict'
app.service('ImprimirService', ['$http', '$q', '$window', function ($http, $q, $window) {
    this.Impre = function (etiqueta) {
        var defered = $q.defer();

        console.log("Entrando al Servicio Enviar datos para Imprimir")
        $http({
            method: 'POST',
            url: 'Labels/Impre',
            params: {
                'etiqueta': JSON.stringify(etiqueta)
            },
             dataType:'json'
            //params:{Itemcode:itemcode}

        })
            .then(function (response) {
                defered.resolve(response);
            },
            function (err) {
                defered.reject(err);
            });

        return defered.promise;

    }
}]);

driver c #

  [AllowAnonymous]
        [HttpPost]
        public JsonResult Impre(Imprimir etiqueta)
        {

            CentralPOSDataManager Code = new CentralPOSDataManager();
            var result = Code.Imprimir(etiqueta);
            return Json(result, JsonRequestBehavior.AllowGet);
        }

public MethodResponse<Imprimir> Imprimir(Imprimir etiqueta)
        {


            MethodResponse<Imprimir> Result = new MethodResponse<Imprimir>() { Code = 100, Message = "Impresion Exitosa", Result = new Imprimir() };
            try
            {
               var ClaveTruper = "CTF-1/2";
                var Descripcion = "Cinta de teflon 1/2";
                var Precio = "$4";
                var PrecioEspecial = "$2";
                var PrecioFabrica = "$3";
                var Xml = "";//'<?xml version="1.0" encoding="utf-8"?><ThermalLabel Version="7.0" Width="60" Height="49" GapLength="3" MarkLength="0" OffsetLength="0" UnitType="Mm" LabelsPerRow="1" LabelsHorizontalGapLength="0" IsContinuous="False" PrintSpeed="" PrintMirror="False" CutAfterPrinting="False" ><Items><TextItem Name="Precio" Y="26" DataField="Precio" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="60" Height="15" Text="_x0024__x0020_1_x002C_495" Font="Arial,42,True,False,False,False,Point,,,False,90,,CP850" TextAlignment="Center" CultureName="en-US" /><TextItem Name="Descripcion" X="1" Y="6" DataField="Descripcion" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="57" Height="20" Text="Despachador_x0020_de_x0020_brocas_x0020_de_x0020_alta_x0020_velocidad_x0020_29_x0020_piezas" Font="Arial,16,Point,,,False,90,,CP850" TextAlignment="Center" CultureName="en-US" /><TextItem Name="CodigoProducto" X="1" Y="2" DataField="CodigoProducto" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="20" Height="4" Text="_x0031_4351" Font="Arial Black,9,Point,,,False,90,,CP850" TextAlignment="Justify" CultureName="en-US" /><TextItem Name="ClaveTruper" X="37.9686334474495" Y="2" DataField="ClaveTruper" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="20" Height="4" Text="DESP-BAV-29C" Font="Arial Black,9,Point,,,False,90,,CP850" TextAlignment="Right" CultureName="en-US" /><TextItem Name="PrecioEspecial" X="1" Y="44" DataField="PrecioEspecial" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="29" Height="4" Text="Especial_x0020_1_x002C_495" Font="Arial,9,Point,,,False,90,,CP850" CultureName="en-US" /><TextItem Name="PrecioFabrica" X="30" Y="44" DataField="PrecioFabrica" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="28" Height="4" Text="Fábrica_x0020_1_x002C_150" Font="Arial,9,Point,,,False,90,,CP850" TextAlignment="Right" CultureName="en-US" /><TextItem Name="CapacidadGancho" X="21.4641520797575" Y="1.95020953998517" DataField="CapacidadGancho" DataFieldFormatString="" CacheItemId="" Comments="" Tag="" Width="16.0243443647563" Height="4" Text="G8" Font="Arial Black,9,Point,,,False,90,,CP850" TextAlignment="Center" CultureName="en-US" /></Items></ThermalLabel >'; 
                var CapacidadGancho = "G30";
                var CodigoProducto = "12520";
               // Arr ntl = etiqueta;//[ CodigoProducto, ClaveTruper, Descripcion, Precio, PrecioEspecial, PrecioFabrica, Xml, CapacidadGancho ];
                var tl = Neodynamic.SDK.Printing.ThermalLabel.CreateFromXmlTemplate(etiqueta.Xml.ToString());
                using (PrintJob pj = new PrintJob())
                {

                    PrinterSettings myPrinter = new PrinterSettings();

                        myPrinter.ProgrammingLanguage = ProgrammingLanguage.EPL;


                    pj.PrinterSettings = myPrinter;
                    pj.Print(tl);
                }
            }
            catch (Exception ex)
            {
                Result.Message = ex.Message + "METODO RESPONDE DE ETIQUETAS";
            }
            return Result;
        }

I hope someone can give me a solution u.u thanks