How to save a XML file that has been generated from XDocument class

private static void SaveFile(XDocument doc, string fileName, string fileExtension)
        {
            //show save as dialog
            using (SaveFileDialog saveFileDialog1 = new SaveFileDialog())
            {
                //Set Save dialog properties
                saveFileDialog1.Filter = "Files (*" + fileExtension + ")|*" + fileExtension;
                saveFileDialog1.Title = "Save File as";
                saveFileDialog1.CheckPathExists = true;
                saveFileDialog1.FileName = fileName + fileExtension;

                if (saveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    doc.Save(saveFileDialog1.FileName);
                }
            }
        }