How Do I Read Files Form Html Control To C# Code And How To Save In Server?

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How do i read files form html control to C# code and how to save in server?

I have one html input control in my html page. When i click on upload i want to save that file in server folder using .net code. but how can i read and save that file.
Below is my code,
Angular js side code,
function RRUplaod() {
var File;
File = $('#FileUpload')[0].files[0];
if (File != "") {
var fileName = File.name;
fileName = fileName + '^' + id
var xhr = new XMLHttpRequest();
var url = //service url
xhr.open('POST', url, true);
xhr.setRequestHeader("FN", fileName);
inviteFileName = fileName;
xhr.onreadystatechange = function () {
};
xhr.send(File);
}

C# code

public UploadedFile UplaodFile(Stream Uploading)
   {
          IncomingWebRequestContext woc = WebOperationContext.Current.IncomingRequest;
           WebHeaderCollection headers = woc.Headers;
           string fileName = "";
           string id= "";

           fileName = headers["FN"].Split('^')[0];
           id= headers["FN"].Split('^')[1];

           UploadedFile upload = new UploadedFile
           {
               FilePath = Path.Combine(HttpContext.Current.Server.MapPath(".") + "\\Document\\", fileName)
           };


           FileStream fs = new FileStream(upload.FilePath, FileMode.Open, FileAccess.Read);
           byte[] ImageData = new byte[fs.Length];
           fs.Read(ImageData, 0, System.Convert.ToInt32(fs.Length));
           fs.Close();

}

but i dont know how to save that file using c# code...
Please help