protected void btnDelete_Click(object sender, EventArgs e)
{
Button bt = (Button)sender;
int nid = Convert.ToInt32(((HiddenField)(bt.Parent.FindControl("HiddenField1"))).Value);
if (CommentsService.DeleteComments(nid) > 0)
{
ClientScript.RegisterStartupScript(this.GetType(), "message", "<script language='javascript' >alert('删除成功！');</script>");
BindMessage();
}
}