Listado() public method

public Listado ( string Campos, string Condicion, string Orden ) : DataTable
Campos string
Condicion string
Orden string
return System.Data.DataTable
        protected void BuscarButton_Click1(object sender, EventArgs e)
        {
            int Id = 0;
            Metas meta = new Metas();
            if (ConsultaTextBox.Text.Length > 0 && ConsultaDropDownList.Text == "MetaId")
            {
                bool result = Int32.TryParse(ConsultaTextBox.Text, out Id);
                if (Id > 0)
                {
                    MetasGridView.DataSource = meta.Listado(" * ", " MetaId = " + Id, "");
                    MetasGridView.DataBind();
                    if (MetasGridView.Rows.Count <= 0)
                    {
                        ShowToast("error", "Error", "Id No Existe");
                        ConsultaTextBox.Text = "";
                        CargarGridView();
                    }

                }
                else
                {
                    ShowToast("warning", "Incorrecto", "Id Incorrecto");
                    ConsultaTextBox.Text = "";
                }

            }

            if (ConsultaDropDownList.Text == "Descripcion")
            {
                MetasGridView.DataSource = meta.Listado(" * ", "Descripcion like '" + ConsultaTextBox.Text + "%'", "");
                MetasGridView.DataBind();
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                Metas meta = new Metas();

                MetasReportViewer.ProcessingMode = Microsoft.Reporting.WebForms.ProcessingMode.Local;
                MetasReportViewer.Reset();
                MetasReportViewer.LocalReport.ReportPath = Server.MapPath(@"~\Rpts/MetasRpt.rdlc");

                MetasReportViewer.LocalReport.DataSources.Clear();

                MetasReportViewer.LocalReport.DataSources.Add(new Microsoft.Reporting.WebForms.ReportDataSource("MetasDataSet", meta.Listado(" * ", " 1=1 ", "")));
                MetasReportViewer.LocalReport.Refresh();
            }
        }
 public void CargarGridView()
 {
     Metas meta = new Metas();
     MetasGridView.DataSource = meta.Listado(" * ", " 1=1 ", "");
     MetasGridView.DataBind();
 }
 public void ListadoTest()
 {
     Metas meta = new Metas();
     Assert.IsTrue(meta.Listado(" * "," 1=1 "," MetaId ").Rows.Count > 0);
 }