Error Info: index (zero based) must be greater than or equal to zero and less than the size of the argument list.

using System;
//using System.Collections.Generic;
using System.Text;
using System.Reflection;

// This is for the StreamReader class.
using System.IO;

namespace FileExample2
{
	class Program
	{
	  static void Main(string[] args)
        {
            //// Verify that the user entered a filename on the command line.
            if (args.Length < 1)
            {
                string programName = 
                        Path.GetFileNameWithoutExtension(Environment.GetCommandLineArgs()[0]);
                string usageMsg = string.Format("USAGE: {0} <filename>\n", programName);

                Console.WriteLine(usageMsg);
            }
            else
            {
                // The StreamReader class lets us read from a text file.
                // initalized stream to NULL in case the instanticate of the stream fail.
	      StreamReader stream = null;

                try
                {

                    // Instantiating the StreamReader object opens the file.
                    // Note that an exception is thrown if the file cannot be opened--hence
                    // the try/catch block!
                    //
                    // args[0] is presumably the filename supplied on the command line.
                    stream = new StreamReader( args[0] );

                    // Let's read an entire line from the file at a time and, using the comma
                    // as a delimiter, report how many comma-delimited values are on each line.
                    //
                    // Let's also change this loop into a 'for' loop.
                    int lineNum = 1;
                    while(stream.Peek() > 0)
                    {
                        string lineFromFile = stream.ReadLine();
                        string[] values = lineFromFile.Split(new char[] { ',' });
                        Console.WriteLine("Line {0,3:000} has {1,-2} values: {3}", lineNum, values.Length,lineFromFile);

                        ++lineNum;
                    }

                }
                catch (Exception ex)
                {
                    Console.WriteLine("Problem reading file: {0}", ex.Message);
                }
                finally
		  {
                    // Try not to forget to close the file!!  Don't wait for program exit to do it for you.
                    // Always do it in a timely manner because it's a shared resource--another program
                    // might be waiting to use it.
                    stream.Close();
		  }
            }
        }
	}
}