Missing fields when serializing a .NET object

I am having a problem with serializing an object in C #. When an application proceeds to serialize an object, some fields become serialized, while others do not. In the following code:

/// <remarks/>
[System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.3038")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class ACORDInsuranceSvcRqHomePolicyQuoteInqRq
{

    private string rqUIDField;

    private System.DateTime transactionRequestDtField;

    private System.DateTime transactionEffectiveDtField;

    private string curCdField;

    /// <remarks/>
    public string RqUID
    {
        get
        {
            return this.rqUIDField;
        }
        set
        {
            this.rqUIDField = value;
        }
    }

    /// <remarks/>
    public string CurCd
    {
        get
        {
            return this.curCdField;
        }
        set
        {
            this.curCdField = value;
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlIgnore()]
    public System.DateTime TransactionRequestDt
    {
        get
        {
            return this.transactionRequestDtField;
        }
        set
        {
            this.transactionRequestDtField = value;
        }
    }

    /// <remarks/>
    [XmlElement("TransactionRequestDt")]
    public string TransactionRequestDtString
    {
        get
        {
            return String.Format("{0:yyyy-MM-dd}", this.TransactionRequestDt);
        }
    }

    /// <remarks/>
    [System.Xml.Serialization.XmlIgnore]
    public System.DateTime TransactionEffectiveDt
    {
        get
        {
            return this.transactionEffectiveDtField;
        }
        set
        {
            this.transactionEffectiveDtField = value;
        }
    }

    /// <remarks/>
    [XmlElement("TransactionEffectiveDt")]
    public string TransactionEffectiveDtString
    {
        get
        {
            return String.Format("{0:yyyy-MM-dd}", this.TransactionEffectiveDt);
        }
    }
}

you can see that the RqUID and CurCd of the / Accessors fields are called, but TransactionRequestDtString and TransactionEffectiveDtString do not. I need all of them to be serialized. Thank!