private void InputClear(Control EditArea)
        {
            foreach (Control Ctrl in EditArea.Controls)
            {
                if (Ctrl.GetType().Equals(typeof(TextBox)))
                {
                    Ctrl.Text = "";
                }
                if (Ctrl.GetType().Equals(typeof(ComboBox)))
                {
                    ComboBox cmb = (ComboBox)Ctrl;
                    cmb.SelectedIndex = 0;
                }
                if (Ctrl.GetType().Equals(typeof(DateTimePicker)))
                {
                    DateTimePicker dtp = (DateTimePicker)Ctrl;
                    dtp.Value = http://www.mamicode.com/DateTime.Now;
                }
            }
        }

根据需要把所有可能用到的控件添加进去