protected void Page_Load(object sender, EventArgs e)
{
DAl data = new DAl();
int count = 4;
string sql = "SELECT TOP {0} id,title,sm,img FROM slider_news WHERE slider=1 ORDER BY id DESC";
sql = string.Format(sql, count.ToString());
rep_slider.DataSource = data.select(sql);
rep_slider.DataBind();
}