protected void btnQuery_Click(object sender, EventArgs e) { string macongty = Session["congty"].ToString(); if (DropBoPhan.SelectedValue.ToString().Trim() == "All") { GridView1.DataSource = dal.QryUser(macongty); GridView1.DataBind(); } else { string mabophan = DropBoPhan.SelectedValue.ToString(); GridView1.DataSource = dal.QryUserByDepart(macongty, mabophan); GridView1.DataBind(); } }