Get line breaks of a textarea with JavaScript

I have a text area.

<textarea style="font-size:15px;text-align:left;width:500px;height:150px" class="control-label"  id="txtTextoTemplate">{{txtTextoTemplate}}</textarea>

This text, I need it to modify a text that I use in conjunction with a library to send mails automatically. Suppose that in the text area I write the following

hola
este es un
ejemplo
del error

Using the following function in JS, I get the text:

var TextoTemplate = document.getElementById('txtTextoTemplate').value;

and in the following method I call my function of c #, sending the necessary parameters.

$scope.Guardar = function () {
    $scope.isViewLoadingGuardar = true;
    $("#btnGuardar").prop('disabled', 'disabled');
    $scope.MostrarMensajeOk = false;
    $scope.MostrarMensajeError = false;

    //Obtengo el texto del textArea
    var TextoTemplate = document.getElementById('txtTextoTemplate').value;

    $http({
        method: 'POST',
        url: baseURL + 'Configuracion/ModificarTemplate/?Id=' + $scope.Id + "&Texto=" + encodeURIComponent(TextoTemplate) + "&Nombre=" + $scope.lblNombreTemplate,
    }).success(function (result) {
        if (result != null) {
            $scope.isViewLoadingGuardar = false;
            $("#btnGuardar").prop('disabled', '');
            $scope.MostrarMensajeOk = false;
            $scope.MostrarMensajeError = false;

            $scope.volver();
        }
    }).error(function (data, status, headers, config) {
        $scope.isViewLoadingGuardar = false;
        $("#btnGuardar").prop('disabled', '');
        alert(data);
        $scope.MostrarMensajeOk = false;
        $scope.MostrarGrilla = false;
        $('html, body').animate({ scrollTop: 0 }, 'slow');
    });

};

but what this function sends me is "Hello, this is an example of the error." So how can I get the line breaks to insert the "\ n" character in my sql? The character "\ n" are the line breaks. By C # I can not, since to the next method

 public IHttpActionResult ModificarTemplate(int Id, string Texto, string Nombre)
    {
        try
        {
            //guardo el dato en la base.
        }
        catch (Exception ex)
        {
          //error al guardar
        }

    }

the Text variable and I get everything together.