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Код

        public Form1()
        {
            InitializeComponent();

            List<NumericUpDown> numericsOnForm = new List<NumericUpDown>();
            FindAllSpecifiedControls(this, numericsOnForm);

            StringBuilder sb = new StringBuilder();
            foreach (NumericUpDown numeric in numericsOnForm)
                sb.AppendFormat("{0}.Value = {1}{2}", numeric.Name, numeric.Value, Environment.NewLine);
            MessageBox.Show(sb.ToString());
        }

        private static void FindAllSpecifiedControls<T>(Control container, List<T> result) where T : Control
        {
            foreach (Control c in container.Controls)
            {
                if (c.Controls.Count != 0)
                    FindAllSpecifiedControls(c, result);

                T temp = c as T;
                if (temp != null)
                    result.Add(temp);
            }
        }