protected void btnRelatorio_Click1(object sender, EventArgs e) { TurmasBL turmasBL = new TurmasBL(); Session["ldsRel"] = turmasBL.PesquisarDiarioDataset(txtEvento.Text, txtTurma.Text, txtDataIni.Text, txtDataFim.Text).Tables[0]; if (((DataTable)Session["ldsRel"]).Rows.Count != 0) { ScriptManager.RegisterStartupScript(this, this.GetType(), Guid.NewGuid().ToString(), "WinOpen('/Relatorios/RelTurmasDiario.aspx','',600,915);", true); } else { ScriptManager.RegisterStartupScript(this, this.GetType(), Guid.NewGuid().ToString(), "alert('Sua pesquisa não retornou dados.');", true); } }