protected void OnTvUsuariosCursorChanged(object sender, EventArgs e)
{
TreeSelection seleccion = (sender as TreeView).Selection;
TreeIter iter;
TreeModel model;
if (seleccion.GetSelected(out model, out iter))
{
u = dtu.listarUsuarioById(Convert.ToInt32(model.GetValue(iter, 0)));
Console.WriteLine(u);
this.txtID.Text = u.Idusuario.ToString();
this.txtUsuario.Text = u.NombreUsuario.ToString();
}
}