Need program to rename

Trading Symbol,Time,Open,High,Low,Close/Price,Volume
NIFTY15JULFUT,29-07-2015 15:30:00,8382.4500,8382.4500,8382.4500,8382.4500,850
NIFTY15JULFUT,29-07-2015 15:29:00,8381.0000,8382.9500,8380.7000,8382.3000,132250
NIFTY15JULFUT,29-07-2015 15:28:00,8379.3500,8382.0000,8379.2500,8381.0000,122800
NIFTY15JULFUT,29-07-2015 15:27:00,8377.4500,8379.4500,8377.0000,8379.2500,75425
NIFTY15JULFUT,29-07-2015 15:26:00,8376.9000,8377.5000,8375.0500,8377.0000,56025

try
            {           
            string path = Directory.GetCurrentDirectory();
            string[] FileArray = Directory.GetFiles(path, "*.csv"); 
                if (FileArray.Length > 0)
                {
                    foreach (string name in FileArray)
                    {
                        var lines = File.ReadLines(name);
                        string line = lines.Last();
                        if (!String.IsNullOrEmpty(line))
                        {
                            string[] fields = line.Split(',');
                            if (fields.Length >= 0)
                            {
                                string newFileName = path + "\\" + fields[0] + ".csv";
                                File.Move(name, newFileName); // Rename the oldFileName into newFileName
                            }
                            else
                            {
                                Console.WriteLine("Not a valid comma seperated file");
                                Console.ReadLine();
                            }
                        }
                        else
                        {
                            Console.WriteLine("No data found in file");
                            Console.ReadLine();
                        }
                    }
                }
                else
                {
                    Console.WriteLine("No CSV Files found in the current folder");
                    Console.ReadLine();
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.ReadLine();
            }