YetAnotherRelogger.Forms.Wizard.WizardMain.ValidateMaskedTextbox C# (CSharp) Method

        public bool ValidateMaskedTextbox(MaskedTextBox test)
        {
            if (test.Text.Length == 0)
            {
                test.BackColor = _invalidColor;
                return false;
            }

            test.BackColor = _validColor;
            return true;
        }

 public bool ValidateInput()
 {
     return(WM.ValidateTextbox(textBox3) &
            WM.ValidateTextbox(textBox1) &
            WM.ValidateMaskedTextbox(maskedTextBox1) &
            (!checkBox2.Checked || (WM.ValidateTextbox(textBox12) & WM.ValidateTextbox(textBox13)))
            );
 }