title: Checking Textbox Text for Null
body: <p>I am using the following code to check for a null text-box, and, if it is null, skip the copy to clipboard and move on to the rest of the code.</p>
  
  <p>I don't understand why I am getting a "Value cannot be NULL" exception.  Shouldn't it see the null and move on without copying to the clipboard?</p>
  
  <pre><code>private void button_Click(object sender, EventArgs e)
  {
      if (textBox_Results.Text != null) Clipboard.SetText(textBox_Results.Text);            
  
      //rest of the code goes here;
  }
  </code></pre>