foreach (UIElement item in this.LayoutRoot.Children)

            {

                if (item is TextBox)

                {

                    (item as TextBox).Text = string.Empty;

                }

                if (item is ComboBox)

                {

                    (item as ComboBox).SelectedValue = null;

                }

                if (item is CheckBox)

                {

                    (item as CheckBox).IsChecked = false;

                }

            }