protected void DDLgroupMax_SelectedIndexChanged(object sender, EventArgs e) { if (DDLgroupMax.SelectedValue != "") { int Sgrade = Int32.Parse(DDLgrade.SelectedValue.ToString()); int Sclass = Int32.Parse(DDLclass.SelectedValue.ToString()); LearnSite.BLL.Room rbll = new LearnSite.BLL.Room(); int groupMax = Int32.Parse(DDLgroupMax.SelectedValue); rbll.SetRgroupMax(Sgrade, Sclass, groupMax); } }