odd .net serialization problem

i an rare problem now i perplexing serialize an object. vigilant generated around "add use reference" web use (svcutil.exe).

the problem next ability (agencyid) being serialized rest object. out foolishness i commented ability next since "xmlignoreattribute" assigned... after i commented abandoned property, agencyid domain serialized expected.

can someone greatfully explain me since function occurred?
thanks!!

        /// <remarks/>
    [system.xml.serialization.xmlelementattribute(form=system.xml.schema.xmlschemaform.unqualified, order=1)]
    open twine agencyid
    {
        {
            relapse this.agencyidfield;
        }
        set {
            this.agencyidfield = value;
            this.raisepropertychanged("agencyid");
        }
    }

    /// <remarks/>
    [system.xml.serialization.xmlignoreattribute()]
    open bool agencyidspecified
    {
        get
        {
            relapse this.agencyidfieldspecified;
        }
        set
        {
            this.agencyidfieldspecified = value;
            this.raisepropertychanged("agencyidspecified");
        }
    }