Plz check the codes and tel me wats wrong with this. I am not getting any error messages but also not the output.

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string alphaFilePath = @"C:\Users\trainee\Documents\visual studio 2010\Projects\ConsoleApplication3\ConsoleApplication3\bin\Debug\input.txt";

            List<string> alphaFileContent = new List<string>();

            using (FileStream fs = new FileStream(alphaFilePath, FileMode.Open))
            using (StreamReader rdr = new StreamReader(fs))
            {
                while (!rdr.EndOfStream)
                {
                    alphaFileContent.Add(rdr.ReadLine());
                }
            }

            string betaFilePath = @"C:\Users\trainee\Documents\visual studio 2010\Projects\ConsoleApplication3\ConsoleApplication3\bin\Debug\check.csv";

            StringBuilder sb = new StringBuilder();


            using (FileStream fs = new FileStream(betaFilePath, FileMode.Open))
            using (StreamReader rdr = new StreamReader(fs))
            {
                while (!rdr.EndOfStream)
                {
                    string[] betaFileLine = rdr.ReadLine().Split(Convert.ToChar(","));

                    if (alphaFileContent.Contains(betaFileLine[0]))
                    {
                        sb.AppendLine(String.Format("{0}, {1}", betaFileLine[0], betaFileLine[1]));
                    }
                }


            }

            using (FileStream fs = new FileStream(@"C:\Users\trainee\Documents\visual studio 2010\Projects\ConsoleApplication3\ConsoleApplication3\bin\Debug\result.txt", FileMode.Create))
            using (StreamWriter writer = new StreamWriter(fs))
            {
                writer.Write(sb.ToString());
            }

            Console.WriteLine(sb.ToString());
        }


    }
}