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