Problem with Connection / Parameter:

Please post your code to see exactly where you went wrong.

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using CSC.GWServices.Tool.TDR;
namespace CSC.GWServices.Tool.TDR.DA
{ [DataObject(true)]
  public class CallDetailTDRRecordDA
  public CallDetailTDRRecordDA()
  {}
  protected string GetDetailTDRData (  int ACTIVITY_ID, DateTime ACTIVITY_DATE, string ACTIVITY_NOTES, string TT_TEXT, string TT_TIMESTAMP, DateTime updateTime )
  {  SqlCommand command = new SqlCommand();
     SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["Test_CONNECTION_Test"].ConnectionString);
     command.commandText = "SELECT ACTIVITY_ID, ACTIVITY_DATE, ACTIVITY_NOTES, TT_TEXT, TT_TIMESTAMP FROM TDR_LOG";
      command.CommandTimeout  = 1200;
      command.CommandType = CommandType.Text;
      string sOrder = string.Empty;
      try
      {   if (ACTIVITY_ID != null)      command.Parameters.Add(CreateParameter("@ACTIVITY_ID", SqlDbType.VarChar));      
            if (ACTIVITY_DATE != null) command.Parameters.Add(CreateParameter("@ACTIVITY_DATE", SqlDbType.DateTime));
            if (ACTIVITY_NOTES != null) command.Parameters.Add(CreateParameter("@ACTIVITY_NOTES", SqlDbType.VarChar));
        }
        catch (Exception e)
        {   throw new Exception(e.Message);
        }
     }
  }
}