C#

public class ErrorObject
    {
        [XmlElement("DateTimeError")]
        public DateTime DateTimeError { get; set; }
        [XmlElement("Message")]
        public string Message { get; set; }
        [XmlElement("InnerMessage")]
        public string InnerMessage { get; set; }
        [XmlElement("ErrorPriority")]
        public ErrorLevel ErrorPriority { get; set; }
        [XmlElement("Dump")]
        public object Dump { get; set; }

        public ErrorObject(DateTime DateTimeError, string Message, ErrorLevel ErrorPriority)
        {
            this.DateTimeError = DateTimeError;
            this.Message = Message;
            this.ErrorPriority = ErrorPriority;
        }
    }

    public enum ErrorLevel { Low, Normal, High, Critical };

public void AddMessage(ErrorObject errorObject)
       {
          // List<ErrorObject> errorObjects = ReadMessages();
           List<ErrorObject> errorObjects = new List<ErrorObject>();


           errorObjects.Add(errorObject);


           XmlSerializer serializer = new XmlSerializer(errorObjects.GetType());

           TextWriter textWriter = new StreamWriter(LogFile);
           serializer.Serialize(textWriter, errorObjects);
           textWriter.Close();

       }

SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=northwind;Integrated Security=True");
            SqlCommand cmdSelect = new SqlCommand("select * from customers", con);
            SqlDataReader dr;
            DataTable dt = new DataTable();
            DataSet ds = new DataSet();
            con.Open();
            dr = cmdSelect.ExecuteReader();
            dt.Load(dr);
            con.Close();

            Microsoft.Reporting.WinForms.ReportDataSource rds = new Microsoft.Reporting.WinForms.ReportDataSource("Customers",dt);
            this.reportViewer2.LocalReport.DataSources.Add(rds);
            this.reportViewer2.LocalReport.ReportEmbeddedResource = "ReportingServices.Report1.rdlc";            
            this.reportViewer2.RefreshReport();