FileInfo not working

hello can i just ask what is wrong with my code:

private void listViewApp_SelectedIndexChanged(object sender,
System.EventArgs e)
{
labelAppName.Text = labelAppCreated.Text = labelAppModified.Text =
labelAppAccessed.Text = "";
if (listViewApp.SelectedItems.Count > 0)
{
string fullname = (string)listViewApp.SelectedItems[0].Tag;
FileInfo fi = new FileInfo (fullname);
label1.Text = fi.Name;
label2.Text = fi.CreationTime.ToLongDateString ();
label3.Text = fi.LastWriteTime.ToLongDateString ()
label4.Text = fi.LastAccessTime.ToLongDateString ();
}

the label2.Text dosent shows the date the file was build. For example, I build my .exe on my local folder and when i update my .exe to ther server (by copy-paste) it always shows the date when the file was (the first time)copied to that folder and not the date the file was build.

Any help pls.

Thanks.