File attachment using angular JS and ASP.NET MVC(upload and download)

Andy Langg,This Is my JS:
"use strict";

define(['application-configuration' ,'FileUploader','accountsService', 'alertsService'], function (app) {

app.register.controller('AppController', ['$scope', '$rootScope', 'FileUploadController', 'accountsService', 'alertsService',
function ($scope, $rootScope, FileUploader, accountsService, alertsService) {

alert('File Upload');
var uploader = $scope.uploader = new FileUploader({
url: window.location.protocol + '//' + window.location.host + window.location.pathname + '/api/Upload/UploadFile'
});

// FILTERS

uploader.filters.push({

name: 'extensionFilter',
fn: function (item, options) {
debugger;
var filename = item.name;
var extension = filename.substring(filename.lastIndexOf('.') + 1).toLowerCase();
if (extension == "pdf" || extension == "doc" || extension == "docx" || extension == "rtf")
return true;
else {
alert('Invalid file format. Please select a file with pdf/doc/docs or rtf format and try again.');
return false;
}
}
});

uploader.filters.push({
name: 'sizeFilter',
fn: function (item, options) {
debugger;
var fileSize = item.size;
fileSize = parseInt(fileSize) / (1024 * 1024);
if (fileSize <= 20)
return true;
else {
alert('Selected file exceeds the 20MB file size limit. Please choose a new file and try again.');
return false;
}
}
});

uploader.filters.push({
name: 'itemResetFilter',
fn: function (item, options) {
debugger;
if (this.queue.length < 20)
return true;
else {
alert('You have exceeded the limit of uploading files.');
return false;
}
}
});

// CALLBACKS

uploader.onWhenAddingFileFailed = function (item, filter, options) {
console.info('onWhenAddingFileFailed', item, filter, options);
};
uploader.onAfterAddingFile = function (fileItem) {
debugger;
alert('Files ready for upload.');
};

uploader.onSuccessItem = function (fileItem, response, status, headers) {
debugger;
$scope.uploader.queue = [];
$scope.uploader.progress = 0;
alert('Selected file has been uploaded successfully.');
};
uploader.onErrorItem = function (fileItem, response, status, headers) {
debugger;
alert('We were unable to upload your file. Please try again.');
};
uploader.onCancelItem = function (fileItem, response, status, headers) {
debugger;
alert('File uploading has been cancelled.');
};

uploader.onAfterAddingAll = function (addedFileItems) {
debugger;
console.info('onAfterAddingAll', addedFileItems);
};
uploader.onBeforeUploadItem = function (item) {
debugger;
console.info('onBeforeUploadItem', item);
};
uploader.onProgressItem = function (fileItem, progress) {
console.info('onProgressItem', fileItem, progress);
};
uploader.onProgressAll = function (progress) {
console.info('onProgressAll', progress);
};

uploader.onCompleteItem = function (fileItem, response, status, headers) {
debugger;
console.info('onCompleteItem', fileItem, response, status, headers);
};
uploader.onCompleteAll = function () {
console.info('onCompleteAll');
};

console.info('uploader', uploader);


}]);
});



Thats It.
Now Plaese Help me.