How to Clear All Textboxs, All Dropdowns, All Validators in C#

private void ClearEditCustomerForm()

    {

        //Empty out text boxes

        var textBoxes = new List<Control>();

        FindControlsOfType(this.phrEditCustomer, typeof(TextBox), textBoxes);

        foreach (TextBox textBox in textBoxes)

            textBox.Text = "";

        // Dropdowns

        var dropdowns = new List<Control>();

        FindControlsOfType(this.phrEditCustomer, typeof(DropDownList), dropdowns);

        foreach (DropDownList drop in dropdowns)

        {

            drop.SelectedValue = "0";

        }

        //Clear validators

        var validators = new List<Control>();

        FindControlsOfType(this.phrEditCustomer, typeof(BaseValidator), validators);

        foreach (BaseValidator validator in validators)

            validator.IsValid = true;

    }

    static public void FindControlsOfType(Control root, Type controlType, List<Control> list)

    {

        if (root.GetType() == controlType || root.GetType().IsSubclassOf(controlType))

        {

            list.Add(root);

        }

        //Skip input controls

        if (!root.HasControls())

            return;

        foreach (Control control in root.Controls)

        {

            FindControlsOfType(control, controlType, list);

        }

    }