Delete file from my website by asp.net(c#)

using System.IO// add the namesapce

protected void btnSubmit_Click(object sender, EventArgs e)
{
try {
FileInfo TheFile = new FileInfo(MapPath(".") + "\\" + txtFile.Text);
if (TheFile.Exists) {
File.Delete(MapPath(".") + "\\" + txtFile.Text);
}
else {
throw new FileNotFoundException();
}
}

catch (FileNotFoundException ex) {
lblStatus.Text += ex.Message;
}
catch (Exception ex) {
lblStatus.Text += ex.Message;
}

}