test.js

var bDocument;
var serviceURL = "@Url.Action("CreateForm", "Home")";

// save document
TXTextControl.saveDocument(TXTextControl.StreamType.InternalUnicodeFormat, function (e) {
    bDocument = e.data;
    // send document to controller
    $.ajax({
        type: "POST",
        url: serviceURL,
        data: {
            document: e.data
        },
        success: successFunc,
        error: errorFunc
    });
});