Save File

public void Save()
{

    FileStream FileStream = null;
    string FileLocation = "C:\\Users\\" + System.Environment.UserName + "\\Desktop\\SaveFile.txt";
    if (!File.Exists(FileLocation)) {
        FileStream = File.Create(FileLocation);
    }
    if (File.Exists(FileLocation)) {
        using (StreamWriter sw = new StreamWriter(FileLocation)) {
            sw.Write(textbox1.text);
        }
    }

}