send file as a parameter to ajax call

hi,

sending file to controller is null

here what i am doing:

i am trying to upload file to controller and then save it in sql table.

i am using :

in view

and when click save i used this :

var row = { DocumentContent:document.getElementById('DocumentContent').files[0]}

and then send this row as parameter in ajax:

addrow: function (rowid, rowdata, position, commit) {

$.ajax({

url: urlAddDocument,

data: rowdata,

type: "Post",

success: function (data, status, xhr) {

// update command is executed.

flag = 1;

}