public static DataTable getResults(string _reqSelect, string _tableName, int _id_usr)
    {

        string serverIp = "localhost";
        string username = "root";
        string password = "";
        string databaseName = "labo";

        string conString = string.Format("server={0};uid={1};pwd={2};database={3};", serverIp, username, password, databaseName);
        MySqlConnection con = new MySqlConnection(conString);

        DataSet daSet1 = new DataSet();
        DataTable daTable1 = new DataTable();

        try
        {
            MySqlCommand cmd;
            con.Open();
            cmd = new MySqlCommand(_reqSelect, con);
            //cmd.Parameters.AddWithValue("@dt_cre", dt_cre);
            //cmd.Parameters.AddWithValue("@id_societe", _id_societe);

            MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
            adapter.Fill(daSet1, _tableName);
            daTable1 = daSet1.Tables[_tableName];

        }
        catch (Exception ex)
        {
            //labo.modele.SYS_LOG_Modele.tracerException(ex, _reqSelect);
        }

        try
        {
            con.Close();
        }
        catch (Exception ex)
        {
            //labo.modele.SYS_LOG_Modele.tracerException(ex);
        }
        return daTable1;

    }
}

DataTable dt = getResults("select id,nom,prenom from
       app_patient","app_patient", 1);

//ReportParameter rp = new ReportParameter("ReportParameter1", "test test");
        this.ReportViewer1.Reset();
        this.ReportViewer1.Visible = true;
        this.ReportViewer1.LocalReport.ReportPath = "Report1.rdlc";
        //this.ReportViewer1.LocalReport.SetParameters(new ReportParameter[] { rp });
        this.ReportViewer1.LocalReport.DataSources.Clear();
        this.ReportViewer1.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", dt));
        //this.ReportViewer1.DataBind();
        this.ReportViewer1.LocalReport.Refresh();