public SingleFactura()
        { 
            ReadBC objRead = new ReadBC();
            Proveedores = objRead.ReadProvedor();

           

            /*txtIdProvedor.ItemsSource = Proveedores;
            txtIdProvedor.SelectedValue = "IdProvedor";
            
            */

            factura.Fecha = DateTime.Now;
            InitializeComponent();

            Binding binding = new Binding();
            binding.Source = Proveedores;

            txtIdProvedor.DisplayMemberPath = "Nombre";
            txtIdProvedor.SelectedValuePath = "IdProvedor";
            txtIdProvedor.SetBinding(ComboBox.ItemsSourceProperty, binding);

            this.DataContext = factura;
           
        }
        public ListProvedor()
        {
            InitializeComponent();

            ReadBC obj = new ReadBC();
            Provedors = obj.ReadProvedor();

            this.DataContext = Provedors;

        }
 public void Update() 
 {
     ReadBC obj = new ReadBC();
     this.DataContext = obj.ReadProvedor();
 }