Why the timer3 interval so slow even if i set it to 10 ?

[EDN Admin]

I have this click button event where i start the timer3:

<pre class="prettyprint private void button5_Click(object sender, EventArgs e)
{
_indx = 0;
if (HistogramLoadedFile == true)
{
DirectoryInfo dir = new DirectoryInfo(directoryName);
if (_files == null)
_files = new List<FileInfo>();

FileInfo[] fi = dir.GetFiles("*.bmp");
_files.AddRange(fi);

_files = _files.OrderBy(f => f.LastWriteTime).ToList();
button5.ForeColor = Color.Red;
button6.ForeColor = Color.Black;
button7.ForeColor = Color.Black;
timer3.Start();
button6.Enabled = true;
button6.Text = "Pause";
button7.Enabled = true;
}
else
{
DirectoryInfo dir = new DirectoryInfo(subDirectoryName);
if (_files == null)
_files = new List<FileInfo>();

FileInfo[] fi = dir.GetFiles("*.bmp");
if (fi.Length == 0)
{
fi = _fi;
}
_files.AddRange(fi);

_files = _files.OrderBy(f => f.LastWriteTime).ToList();
button5.ForeColor = Color.Red;
button6.ForeColor = Color.Black;
button7.ForeColor = Color.Black;
timer3.Start();
button6.Enabled = true;
button6.Text = "Pause";
button7.Enabled = true;
}
}[/code]
And then the timer3 tick event:

<pre class="prettyprint private void timer3_Tick(object sender, EventArgs e)
{
//timer3.Stop();
try
{
Image iOLd = this.pictureBox1.Image;
Image img = Image.FromFile(_files[_indx].FullName);
myTrackPanelss1.trackBar1.Value = _indx;
label22.Text = _files[_indx].Name;
this.pictureBox1.Image = img;

if (iOLd != null)
iOLd.Dispose();

_indx++;

if (_indx >= _files.Count)
_indx = 0;

timer3.Interval = 10;
timer3.Start();
}
catch
{

}


}[/code]
The timer interval is set to 10. So why its moving so slow ? And why in the end the timer stop ?
The end i mean when the trackBar1 slider get to the end. Instead of repeating and keep playing it stop i dont understand why.
Two strange things. And this is the only place i set in my code the timer3 interval.
1. Why its slow ?
2. Why it stop in the end ?
And the variable _files contain 2255 files(indexs) inside. <hr class="sig danieli

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