IDataReader System.IndexOutOfRangeException on Class File Object

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
 
/// <summary>
/// Summary description for Data999
/// </summary>
/// 
 
public class Data999
{
    private string _DataTitle;
    public string DataTitle
    {
        get { return _DataTitle; }
        set { _DataTitle = value; }
    }
 
    private string _Forename;
    public string Forename
    {
        get { return _Forename; }
        set { _Forename = value; }
    }
 
    private string _Surname;
    public string Surname
    {
        get { return _Surname; }
        set { _Surname = value; }
    }
 
    private string _Honours;
    public string Honours
    {
        get { return _Honours; }
        set { _Honours = value; }
    }
 
    private string _BusinessPrefix;
    public string BusinessPrefix
    {
        get { return _BusinessPrefix; }
        set { _BusinessPrefix = value; }
    }
 
    private string _Premises;
    public string Premises
    {
        get { return _Premises; }
        set { _Premises = value; }
    }
 
    private string _Throughfare;
    public string Throughfare
    {
        get { return _Throughfare; }
        set { _Throughfare = value; }
    }
 
    private string _Locality;
    public string Locality
    {
        get { return _Locality; }
        set { _Locality = value; }
    }
 
    private string _Postcode;
    public string Postcode
    {
        get { return _Postcode; }
        set { _Postcode = value; }
    }
 
    private string _addedBy;
    public string addedBy
    {
        get { return _addedBy; }
        set { _addedBy = value; }
    }
 
    private string _TelephoneNumber;
    public string TelephoneNumber
    {
        get { return _TelephoneNumber; }
        set { _TelephoneNumber = value; }
    }
 
    private string _Deleted;
    public string Deleted
    {
        get { return _Deleted; }
        set { _Deleted = value; }
    }
 
 
 
	public Data999(IDataReader reader)
	{
        _addedBy = reader["addedBy"].ToString();
        _TelephoneNumber = reader["TelephoneNumber"].ToString();
        _Deleted = reader["Deleted"].ToString();
        _DataTitle = reader["DataTitle"].ToString();
        _Forename = reader["Forename"].ToString();
        _Surname = reader["Surname"].ToString();
        _Honours = reader["Honours"].ToString();
        _BusinessPrefix = reader["BusinessPrefix"].ToString();
        _Premises = reader["Premises"].ToString();
        _Throughfare = reader["Throughfare"].ToString();
        _Locality = reader["Locality"].ToString();
        _Postcode = reader["Postcode"].ToString();
 
	}
}
 
 
 
================
EXCEPTION DETAILS
================
 
Exception Details: System.IndexOutOfRangeException: DataTitle
 
Source File: c:\Inetpub\wwwroot\eff999\App_code\Data999.cs    Line: 109 
 
Source Error: 
 
 
Line 107:        _TelephoneNumber = reader["TelephoneNumber"].ToString();
Line 108:        _Deleted = reader["Deleted"].ToString();
Line 109:        _DataTitle = reader["DataTitle"].ToString();
Line 110:        _Forename = reader["Forename"].ToString();
Line 111:        _Surname = reader["Surname"].ToString();

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