What is the problem with this code?

for (int w = 0; w < this.Controls.Count; w++)
{
    if (this.Controls[w] is TransparentLabel)
    {
        la = (TransparentLabel)this.Controls[w];
        if (la.Name != "label1")
        {
            la.Visible = false;
            la.Click -= new System.EventHandler(Clicked);
            this.Controls.Remove(this.Controls[w]);
            la.Dispose();
         }
     }
}

I want to clear the screen from the labels, but it doesn't work.