XML Deserialization Null Exception

<LoginName><![CDATA[Name]]></LoginName>

<LoginName><![CDATA[Name]]></LoginName>

public static XmlCDataSection ToCData(this string str)
{
    return new XmlDocument().CreateCDataSection(str);
}

[XmlIgnore] public string LoginName { get; set; }
[XmlElement("LoginName")]
public XmlCDataSection CDataLoginName
{
    get => LoginName.ToCData();
    set => LoginName = value.Value;
}

public static XmlCDataSection ToCData(this string str)
{
    return new XmlDocument().CreateCDataSection(str);
}

[XmlIgnore] public string LoginName { get; set; }
[XmlElement("LoginName")]
public XmlCDataSection CDataLoginName
{
    get => LoginName.ToCData();
    set => LoginName = value.Value;
}