C#

using System;<br />
using System.IO;<br />
using System.Collections;<br />
using System.Text;<br />
<br />
namespace Files_ExtLib1<br />
{<br />
    public class FolderWatcher<br />
    {<br />
        string m_FolderPath;<br />
<br />
        public FolderWatcher()<br />
        {<br />
            //<br />
            // TODO: Add constructor logic here<br />
            //<br />
        }<br />
<br />
        #region Property<br />
        public string FolderPath<br />
        {<br />
            get<br />
            {<br />
                return m_FolderPath;<br />
            }<br />
            set<br />
            {<br />
                m_FolderPath = value;<br />
            }<br />
        }<br />
        #endregion<br />
<br />
        /// <summary><br />
        /// Deletes the files older the days, hours, and<br />
        /// minutes specified<br />
        /// </summary><br />
        /// <param name="Days"></param><br />
        /// <param name="Hrs"></param><br />
        /// <param name="Mins"></param><br />
        /// <returns>Number of files deleted</returns><br />
        public int DeleteFilesOlderThan(int Days, int Hrs, int Mins)<br />
        {<br />
            string[] oldFilePaths = FilesOlderThan(Days, Hrs, Mins);<br />
            int count = 0;<br />
            foreach (string filePath in oldFilePaths)<br />
            {<br />
                try<br />
                {<br />
                    File.Delete(filePath);<br />
                    count++;<br />
                }<br />
                catch (Exception e)<br />
                {<br />
                    Console.WriteLine("Unable to delete " + filePath);<br />
                    Console.WriteLine("Reason: {0}", e);<br />
                    //Console.WriteLine("Detected an exception!!!\n" + e );<br />
                }<br />
                Console.WriteLine("Files successfully deleted");<br />
            }<br />
            // presumably number of files deleted to be returned<br />
            return count;<br />
        }<br />
<br />
<br />
        /// <summary><br />
        /// Reurns filenames having last modified time older than<br />
        /// specified period.<br />
        /// </summary><br />
        /// <param name="Days"></param><br />
        /// <param name="Hrs"></param><br />
        /// <param name="Mins"></param><br />
        /// <returns></returns><br />
        public string[] FilesOlderThan(int Days, int Hrs, int Mins)<br />
        {<br />
            TimeSpan ts = new TimeSpan(Days, Hrs, Mins, 0);<br />
            ArrayList oldFilePaths = new ArrayList();<br />
            // FolderPath is assumed to be path being watched<br />
            string[] filePaths = Directory.GetFiles(FolderPath);<br />
            DateTime currentDate = DateTime.Now;<br />
            foreach (string filePath in filePaths)<br />
            {<br />
                DateTime lastWriteDate = File.GetLastWriteTime(filePath);<br />
                if ((currentDate - lastWriteDate) > ts)<br />
                {<br />
                    oldFilePaths.Add(filePath);<br />
                }<br />
            }<br />
            return (string[])oldFilePaths.ToArray(typeof(string));  <br />
        }<br />
    }<br />
}

this.oleDbDataAdapter1.Fill(this.dataSet11,"Unit1Mail");<br />
i = this.dataSet11.Tables["Unit1Mail"].Rows.Count;

this.dataSet11.Clear();<br />
this.oleDbDataAdapter1.Fill(this.dataSet11, "Unit1Mail");<br />
if (this.dataSet11.Tables["Unit1Mail"].Rows.Count > i) // 'i' is the old number calculated on form load<br />
   this.label1.Text = " You have a new message";