[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
 

    private void Form1_Load(object sender, EventArgs e)
    {
      SendMessage(this.progressBar1.Handle, 0x410, 1, 0);//green
      SendMessage(this.progressBar2.Handle, 0x410, 3, 0);//yellow
      SendMessage(this.progressBar3.Handle, 0x410, 2, 0);//red

    }