private void m_DoMathButton_Click(object sender, EventArgs e)
        {
            ISampleProvider math = SampleProviderFactory.CreateSampleProvider();

            int result = math.DoMath(Convert.ToInt32(m_XTextBox.Text, 10),
                                     Convert.ToInt32(m_YTextBox.Text, 10));

            m_ResultLabel.Text = result.ToString();
        }