文档的问题

Question

有一个文档格式是：　　　　　line1
line2
line3
line4
........
现要求把这个文档旋转９０度，该怎样实现？！！！

Answer 1

private void button2_Click(object sender, EventArgs e)
        {
            StreamWriter srs;
            int index = 0;
            string  file = "C://1.txt";
            List<string> tmp = new List<string>();
            using (StreamReader sr = new StreamReader(file))
            {
               string LineString = sr.ReadLine();
               tmp.Add(LineString);
               while (LineString!= null)
                {
                    LineString = sr.ReadLine();
                    tmp.Add(LineString);
                    index++;
                }
                sr.Close();
                tmp.Reverse(0, index);
                srs = File.CreateText(file);
                for (int i = 0; i < index; i++)
                {
                    srs.WriteLine(tmp[i]+"\r");
                }    
                srs.Close();
            }           }