SaveToController.js

function SaveToController(DocumentName) {
    TXTextControl.saveDocument(TXTextControl.streamType.InternalUnicodeFormat,
        function (e) {

        var serviceURL = "/Home/SaveTemplate";

            $.ajax({
                type: "POST",
                url: serviceURL,
                contentType: 'application/json',
                data: JSON.stringify({
                    DocumentName: DocumentName,
                    BinaryDocument: e.data
                }),
                success: successFunc,
                error: errorFunc
            });

            function successFunc(data, status) {
                alert("Document has been saved successfully.");
            }

            function errorFunc() {
                alert('Error');
            }
    });
}