angularjs post file to web api - vb.net

Question

I've a angular function for to upload file to web api
$scope.uploadFile = function () {
var file = $scope.file;
console.log("file: " + file);
var xhr = new XMLHttpRequest();
xhr.upload.addEventListener("progress", uploadProgress, false);
xhr.addEventListener("load", uploadComplete, false);
xhr.addEventListener("error", uploadFailed, false);
xhr.addEventListener("abort", uploadCanceled, false);
xhr.open("POST", uri);
xhr.setRequestHeader("Content-Type", "multipart/form-data");
xhr.setRequestHeader("X-File-Name", file.fileName);
xhr.setRequestHeader("X-File-Size", file.fileSize);
xhr.setRequestHeader("X-File-Type", file.type);
$scope.progressVisible = true;
xhr.send(file);
}
function uploadProgress(evt) {
$scope.$apply(function () {
if (evt.lengthComputable) {
$scope.progress = Math.round(evt.loaded * 100 / evt.total);
}
})
}
function uploadComplete(evt) {
/* This event is raised when the server send back a response */
alert(evt.target.responseText);
}
function uploadFailed(evt) {
alert("There was an error attempting to upload the file.");
}
function uploadCanceled(evt) {
$scope.$apply(function () {
$scope.progressVisible = false;
})
alert("The upload has been canceled by the user or the browser dropped the connection.");
}
The code is available here http://jsfiddle.net/vishalvasani/4hqVu/
I need a web api controller to manage file post, how can I read it?
Is it possible to use PostValue instead of task async?
Server side I get the file, read content, query a database and return JSON response
Thanks