Error When Get Result type DataTable form Web Service(ASMX)

I have problem in my android xamarin with asmx web service
when i return Data type of DataTable
befor is work fine but after i install new visaul studio 2015 not working my code is :
in web service (ASMX) :
public DataTable allchant(string password)
tablechantTableAdapter chanttable = new tablechantTableAdapter();
DataTable dt = new DataTable();


        dt = chanttable.GetData();

    return dt;

in my xamarin android app :
private void Btn2_Click(object sender, System.EventArgs e)
songservice.ZawamelService ws = new songservice.ZawamelService();

        ws.allchantCompleted += Ws_allchantCompleted;

    private void Ws_allchantCompleted(object sender, songservice.allchantCompletedEventArgs e)
        DataTable dt = new DataTable();
        dt = e.Result;

show my this error in action complete , erro in image

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