C#把数据写到硬盘指定位置

FileStream fs;
StreamWriter sw;
string RootPath = @"C:\Advantech" + "\\tempData\\" + "data.txt";
fs=new FileStream(RoothPath,FileMode.Creat,FileAccess.Write)//绝对地址
sw=new StreamWriter(fs);
sw.Write(data);

sw.Close();
fs.Close();