Linq Exception While reading file

namespace trycatchtest
{
    class Program
    {
        static void Main(string[] args)
        {
            tryTest t = new tryTest(1);
        }
    }

    public class tryTest
    {

        public tryTest(int a)
        {
            try
            {

                string filePath = @"D:\FTP Root\BUS_01_Argese\CDR\Template1\1Row.csv";
                var orders = System.IO.File.ReadAllLines(filePath).Skip(1);
                var query = from line in orders.AsParallel()
                            select new
                            {
                                CallingNumber = GetCDRColumn()
                            };




                var col = query.ToList();

            }
            catch (Exception ex)
            {
                string s = ex.Message;
            }
        }

        private string GetCDRColumn()
        {
            try
            {
                throw new Exception("My error");

                return string.Empty;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

    }
}