protected void btnAddComment_Click(object sender, System.EventArgs e)
{
Photo photo = (Photo)Session["photo_CurrentPhoto"];
Comment comment = new Comment(HttpUtility.HtmlDecode(txtCommentName.Text),
HttpUtility.HtmlDecode(txtCommentText.Text));
photo.AddComment(comment);
DisplayComments(photo);
txtCommentName.Text = "";
txtCommentText.Text = "";
}