/// 
/// 向下递归查找控件
/// 
/// 查找控件的父容器控件
/// 查找控件名称
/// 若没有查找到返回NULL
public static Control DownRecursiveFindControl(this Control parentControl, string findCtrlName)
{
  Control _findedControl = null;
  if (!string.IsNullOrEmpty(findCtrlName) && parentControl != null)
  {
 foreach (Control ctrl in parentControl.Controls)
 {
   if (ctrl.Name.Equals(findCtrlName))
   {
 _findedControl = ctrl;
 break;
   }
   else
   {
 if (ctrl.Controls.Count > 0)
   _findedControl = DownRecursiveFindControl(ctrl, findCtrlName);
   }
 }
  }
  return _findedControl;
}
/// 
/// 将Control转换某种控件类型
/// 
/// 控件类型
/// Control
/// 转换结果
/// 若成功则返回控件；若失败则返回NULL
public static T Cast(this Control control, out bool result) where T : Control
{
  result = false;
  T _castCtrl = null;
  if (control != null)
  {
 if (control is T)
 {
   try
   {
 _castCtrl = control as T;
 result = true;
   }
   catch (Exception ex)
   {
 Debug.WriteLine(string.Format("将Control转换某种控件类型异常，原因:{0}", ex.Message));
 result = false;
   }
 }
  }
  return _castCtrl;
}

bool _sucess = false;
CheckBox _finded = this.DownRecursiveFindControl("checkBox1").Cast(out _sucess);
if (_sucess)
{
 MessageBox.Show(_finded.Name);
}
else
{
 MessageBox.Show("Not Finded.");
}