如何将字符串转换为int

我有一组名为这样的对象:

_1,_2,_3 .... _n

不是一个数组,只是一组自定义控件的对象.我想将名称转换为int.首先我删除_,但如果使用

    private void Superficie_MouseDown(object sender, MouseButtonEventArgs e)
    {
        int index = 0;
        Shape myShape = ((Shape)sender);
        string lcNombre = myShape.Name.Remove(0, 1);

        //--------------------------------------------------------------------
        // Those are my tryes  
        // Doesn't work because it must expect a nullable value 
        index = lcNombre as decimal; 

        // Doesn't work  Can't convert string to int
        index = (int)lcNombre;
        //--------------------------------------------------------------------


        if (index > 0)
        {
            bool lIsSelected =  !Pieza.Superficies.Where(x=>x.Id == index).First().IsSelected;
            Pieza.Superficies.Where(x => x.Id == index).First().IsSelected = lIsSelected;

            if (lIsSelected)
                myShape.Fill = new SolidColorBrush(SystemColors.HotTrackColor);
            else
                myShape.Fill = new SolidColorBrush(SystemColors.ControlLightLightColor);
        }
    } 

我该怎么做才能施展它？