c#讀寫建立臨時文件

  class Temp
        {
            /// <summary>
            /// 寫臨時文件
            /// </summary>
            /// <param name="user">要寫入文件的內容 不帶後綴</param>
            /// <param name="password">要寫入的內容</param>
            public void WriteTemp(string user,string password)
            {
                string mypath;      //保存路徑
                //得到當程序的路徑
                int i = Application.ExecutablePath.LastIndexOf (@"");
                //得到要保存文件的位置
                mypath = Application.ExecutablePath.Substring(0,i);
                FileInfo myfile = new FileInfo(mypath +@""+ user + ".tmp");
                //判斷文件是否存在
                if (!myfile.Exists)
                {
                    //文件不存在建立一個文件
                    myfile.Create();
                }
                FileStream mystream = new FileStream(myfile.ToString() ,FileMode.Open);
                StreamWriter mywriter = new StreamWriter(mystream,Encoding.Unicode );
                //寫入數據
                mywriter.WriteLine(password);
                mywriter.Flush();
                mywriter.Close();
            }