how to export multiple gridview to pdf

lConnection myConnection = new SqlConnection(connectionString);
        SqlCommand Command = new SqlCommand();
        Command.CommandText = "select origin ,report ,react_delay as 'reactionary delay' ,responsibility ,actions from signals_comm_failure where date = '" + TextBox1.Text + "' and id_class=1";
        Command.Connection = myConnection;
        
        using (SqlDataAdapter da = new SqlDataAdapter(Command))
        {
            DataTable dt = new DataTable();
            da.Fill(dt);
            gd_dt.DataSource = dt;
        }
        Spire.DataExport.PDF.PDFExport PDFExport = new Spire.DataExport.PDF.PDFExport();
        PDFExport.DataSource = Spire.DataExport.Common.ExportSource.DataTable;
        PDFExport.DataTable = this.gd_dt.DataSource as DataTable;
        PDFExport.ActionAfterExport = Spire.DataExport.Common.ActionType.OpenView;
        PDFExport.PDFOptions.PageOptions.Orientation = Spire.DataExport.Common.PageOrientation.Landscape;
        PDFExport.SaveToFile("Report.pdf");

SqlCommand Command2 = new SqlCommand();
        Command2.CommandText = "select origin ,report ,cause ,responsibility ,actions from signals_comm_failure where date = '" + TextBox1.Text + "' and id_class =2";
        Command2.Connection = myConnection;
        using (SqlDataAdapter da2 = new SqlDataAdapter(Command2))
        {
            DataTable dt2 = new DataTable();
            da2.Fill(dt2);
            outside_dt.DataSource = dt2;
        }
        Spire.DataExport.PDF.PDFExport PDFExport = new Spire.DataExport.PDF.PDFExport();
        PDFExport.DataSource = Spire.DataExport.Common.ExportSource.DataTable;
        PDFExport.DataTable = this.outside_dt.DataSource as DataTable;
        PDFExport.ActionAfterExport = Spire.DataExport.Common.ActionType.OpenView;
        PDFExport.PDFOptions.PageOptions.Orientation = Spire.DataExport.Common.PageOrientation.Landscape;
        PDFExport.SaveToFile("Report.pdf");