How to put the first line of text file in the end position

Question

I have a streamwriter. I wrote into a text file all lines but I want to put the first line in the last position of the text file. After writing the stream, i want to switch first line to the last but the first line should not be left blank but to shift the preceeding lines up and then write the stream again. How can i Hold the first line in a variable and start writing from second line and in which part of the code. Thanks in Advance

 

 

using (System.IO.StreamWriter file = new System.IO.StreamWriter(filepath))
           {
               string[] buffer = new string[count];

               while (!(lines = reader.ReadLine()).Contains("Records"))
               {



                   for (int i = 0; i < count - 1; i++)
                   {

                       string[] fields = lines.Split('|');


                       Result[i, 0] = "";

                           Result[i, 1] = fields[1];
                           Result[i, 2] = " ";

                           Result[i, 3] = xx;

                           Result[i, 4] = "";
                           Result[i, 5] = fields[4];
                           Result[i, 6] = "";
                           Result[i, 7] = fields[0];
                           Result[i, 8] = "";

                           if (fields[15].Contains("PASS"))
                           {
                               Result[i, 9] = "P";
                           }
                           else if (fields[15].Contains("FAIL"))
                           {
                               Result[i, 9] = "F";
                           }
                           Result[i, 10] = "";
                           Result[i, 11] = "";
                           Result[i, 12] = "";
                           Result[i, 13] = "";
                           Result[i, 14] = "";

                           }

                       }



                       else if (fields.Length == 7)
                       {


                           Result[i, 1] = "";

                           Result[i, 2] = "";


                           Result[i, 3] = fields[0];                                                       //Test Code
                           Result[i, 4] = "1";                                                                 // Test Channel
                           Result[i, 5] =fields [4];                                                           // Test Value
                           Result[i, 6] = "0";                                                             //Test Frequency

                           if (fields[5].Contains("PASS"))
                           {
                               Result[i, 7] = "P";
                           }
                           else if (fields[5].Contains("FAIL"))
                           {
                               Result[i, 7] = "F";
                           }



                           Result[i, 8] = "0";                             // Test Volt



                                   Result[i, 9] = fields[1];

                                   Result[i, 10] = "0.0";

                               }


                           }

                           Result[i, 11] = "0";
                           Result[i, 12] = "1";
                           Result[i, 13] = "1";
                           Result[i, 14] = "0";
                           Result[i, 15] = Profile_Index.ToString();

                       }

                       result = ("PATS_TEST" + "," + Result[i, 1] + "," + Result[i, 2] + "," + Result[i, 3] + "," + Result[i, 4] + "," + Result[i, 5] + "," + Result[i, 6] + "," + Result[i, 7] + "," + Result[i, 8] + "," + Result[i, 9] + "," + Result[i, 10] + "," + Result[i, 11] + "," + Result[i, 12] + "," + Result[i, 13] + "," + Result[i, 14] + "," + Result[i, 15]);



                       if (fields[0].Contains("END-OF-LINE"))
                       {
                           result = ("END-OF-LINE");
                       }


                   }


                   Profile_Index++;


                   // Console.WriteLine(result);

                   file.WriteLine(result);



                       }