grabar varias imagenes (titanium - android)

I have a problem, I want to record in a database of several images, these I have converted the string, the first three images be recorded properly, but when more than three there is always an error and leaves no record the following records, I ve tried everything, I'm using as a web service (asmx) in c #. My database I have the sql server 2008 and the fields for the pictures are type varchar (max)

function enviar_fotos()
{
    contador = 0;
    lbl_mensaje.text = 'Insertando Fotos Lugar de Instalación...';
    var db = Ti.Database.install('/miData/kabateus','kabateus');
    //var resul = db.execute('SELECT * FROM CI_FOTOS WHERE CODIGO_LIN=?',_codigolin);
    var resul = db.execute('SELECT * FROM CI_FOTOS order by CODIGO_LIN');
    //var filas_c = resul.getRowCount();                        
    while (resul.isValidRow())
    {   
        contador++;     
        var http = 'httpFotos'+contador.toString();
        try
        {   
            var xcodigoLIN = resul.fieldByName('CODIGO_LIN');
            xfoto = resul.fieldByName('FOTO');
            var xnombre = resul.fieldByName('NOMBRE')
            var enviar = 'http://192.168.2.34/WebKabateus/WS_Kabateus.asmx/GrabarFotoLugInstal';
            //var httpFotos = Titanium.Network.createHTTPClient();  
            http = Titanium.Network.createHTTPClient();
            //httpFotos.open('POST',enviar);
            http.open('POST',enviar);       

            var datos = {
                codigoLIN:xcodigoLIN,fotoLIN:xfoto,nombrefoto:xnombre
            }   
            data = JSON.stringify(datos);

            var params = {
                trama: data
            };      
            //httpFotos.send(params);   
            http.send(params);
            /*httpFotos.onload = function()
            {           
                if(this.status == '200')
                {               
                    var oRegExp = new RegExp("<string[^>]*>(.*?)<\/string>", "ig");
                    var result = oRegExp.exec(this.responseText);
                    var valores = result[1];                                
                    if(valores == 'OK')
                    {

                    }else{                  
                    }   
                }else{
                }
            }*/                                                 
            resul.next();
        }catch(e)
        {
            alert(e.message);
        }

    }   
    resul.close();
    db.close(); 

}