Silverlight Multi-Binding

using System;
using System.Windows;
using System.Collections.Generic;
using System.Windows.Data;
using System.Windows.Markup;
using System.Reflection;

namespace slMultiBinding
{

    [ContentProperty("Bindings")]
    public class MyMultiBindingExtension : MarkupExtension
    {

        private List<Binding> _Bindings = new List<Binding>();
        public List<Binding> Bindings
        {
            get { return _Bindings; }
        }

        private IMultiValueConverter _Converter;
        public IMultiValueConverter Converter
        {
            get { return _Converter; }
            set { _Converter = value; }
        }

        /// <summary>
        /// return result as Binding to attached property rather than regular value!
        /// </summary>
        /// <param name="serviceProvider"></param>
        /// <returns></returns>
        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            try
            {
                IProvideValueTarget pvt = serviceProvider.GetService(typeof(IProvideValueTarget)) as IProvideValueTarget;                
                DependencyObject  TargetObject = pvt.TargetObject as DependencyObject ;

                for (int i = 0; i < _Bindings.Count ; i++)
                {
                    string sDpName="Binding"+(i+1).ToString()+"Property";
                    //using reflection to get the DependencyProperty from type/string
                    FieldInfo fi = typeof(MultiBindingUtil).GetField(sDpName);
                    if (fi==null)
                    {
                        throw new IndexOutOfRangeException("MultiBindingUtil Max number of binding(3) exceeded");
                    }
                    DependencyProperty dp = (DependencyProperty)fi.GetValue(null);
                    BindingExpressionBase beb = BindingOperations.SetBinding(TargetObject, dp, _Bindings[i]);                   
                }
                TargetObject.SetValue(MultiBindingUtil.ConverterProperty, this.Converter);

                Binding b = new Binding();
                b.Source = TargetObject;
                b.Path =new PropertyPath(  MultiBindingUtil.MBResultProperty);
                return b;
            }
            catch (Exception)
            {
                
                throw;
            }
            
        }
 
        


     }


}