C#编程：查找窗体内某种控件，并进行属性设置

private void button3_Enter(object sender, EventArgs e)
        {
            foreach (Control tempcon in this.Controls)
            {
                switch (tempcon.GetType().ToString())
                {
                    case "System.Windows.Forms.Label":
   
                        break;
                    case "System.Windows.Forms.Panel":

                        break;
                    case "System.Windows.Forms.GroupBox":

                        break;
                    case "System.Windows.Forms.Button":
                        tempcon.Enabled = false;
                        break;
                }
            }

            Thread.Sleep(3000);

            foreach (Control tempcon in this.Controls)
            {
                switch (tempcon.GetType().ToString())
                {
                    case "System.Windows.Forms.Label":
  
                        break;
                    case "System.Windows.Forms.Panel":

                        break;
                    case "System.Windows.Forms.GroupBox":

                        break;
                    case "System.Windows.Forms.Button":
                        tempcon.Enabled = true;
                        break;
                }
            }
        }