Calculating lines per file in folders and subfolders

Program.cs
 
using System;
using System.Collections;
using System.Collections.Generic;
using GetFileStats;
 
 
namespace GetProjectStats
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            string FilePath = string.Empty;
            int NumberOfLines;
            FileStats FileStat1 = new FileStats();
 
            foreach (string s in args)
            {
                FilePath = s;  // get one arg for now
            }
             NumberOfLines = FileStat1.ProcessFile(FilePath);
            return;
 
        }
    }
}
 
GetFileStats.cs
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Text;
using System.Threading;
using System.Runtime.InteropServices;
using System.Diagnostics;
 
 
 
namespace GetFileStats
{
 
    public class FileStats
    {
 
        public int ProcessFile(string FilePath)
        {
            string line;
            int linecount = 0;
            try 
	{
		//Pass the file path and file name to the StreamReader constructor		StreamReader sr = new StreamReader(FilePath);
 
		//Read the first line of text
		line = sr.ReadLine();
 
		//Continue to read until you reach end of file
		while (line != null) 
		{
			linecount++;
                                                line = sr.ReadLine();
 
		}
 
		//close the file
		sr.Close();
		Console.ReadLine();
	}
	catch(Exception e)
	{
		Console.WriteLine("Exception: " + e.Message);
	}
                return linecount;
        }
 
        public int ProcessFolder(string FolderPath)
        {
            // For each folder call ProcessFile()
            // ????? 		
            return 0;
        }
 
    }
}