"http://" and AppendAllText and an empty line in the begining of the address file

Hello

I wite this code but I have an empty line in the begining of the address file.

            address = "http://"+"…….." + Environment.NewLine;
            String FilePath_address = Application.StartupPath + @"\address.txt";
            if (System.IO.File.Exists(FilePath_address))
            {
                System.IO.File.AppendAllText(FilePath_address, address);
            }