printPreview if statement

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C#

I only want to print some of the textBoxes and comboBoxes not all of them so I can't use the print as an image.

How can I change this so that if it isn't 0 it will show it.

private void button2_Click(object sender, EventArgs e)
        {
            printPreviewDialog1.Document = printDocument1;

            printPreviewDialog1.ShowDialog();
        }

private void printDocument1_PrintPage_1(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
  if (textBox1.Text = 0)
   e.Graphics.DrawString(textBox1.Text, textBox1.Font, Brushes.Black, 100, 120);
   e.Graphics.DrawString(comboBox1.Text, comboBox1.Font, Brushes.Black, 100, 100);

         }