protected void txt_comodity_TextChanged(object sender, EventArgs e) { bl.comoditiy = txt_comodity.Text; DataSet ds = new DataSet(); ds = dl.secectcamodity(bl); if (ds.Tables[0].Rows.Count > 0) { ScriptManager.RegisterStartupScript(this, this.GetType(), "redirect", "alert('The Comoditiy Already Exists'); window.location='tarrif.aspx';", true); } else { txt_tarifno.Focus(); } }