How to jump a cycle If?

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I created a Windows Form Application that in a TextBox you can enter a number, and the program, I modify that number.

I created a loop if, about the program if it finds TextBox.text = null, do not run the calculations. But even if I leave the TextBox empty, I create an exception because misses no value. Should not skip the if loop?

 private void button1_Click(object sender, EventArgs e)
        {

            string strMP3Folder = @"C:\Users\Stefano\Music\shake.mp3";

            string strMP3OutputFilename = @"C:\Users\Stefano\Music\funziona2.mp3";

            using (Mp3FileReader reader = new Mp3FileReader(strMP3Folder))
            {
                int count = 1;
                Mp3Frame mp3Frame = reader.ReadNextFrame();
                System.IO.FileStream _fs = new System.IO.FileStream(strMP3OutputFilename, System.IO.FileMode.Create, System.IO.FileAccess.Write);

                double valoreIniziale = 0;
                if (textBox2.Text != null)
                {
                    valoreIniziale = Convert.ToDouble(textBox2.Text);
                }

                double valorefinale = 1000000;
                if (textBox1.Text != null)
                { valorefinale = Convert.ToDouble(textBox1.Text); }

asked 1 min ago

missenna

20

How to jump a cycle If?