title: if else string is null
body: <p>I have two text box. If 1 of the textbox.text is empty, the MessageBox would show to prompt user that they did not enter the fields completely. However it does not work... </p>
  
  <p>This is the code:</p>
  
  <pre><code>private void tab1nextButton_Click(object sender, RoutedEventArgs e)
  {
      if ((AntcbatchpathTextBox.Text == null) || (MasterbuildpropertiespathTextBox.Text == null))
      {
          System.Windows.MessageBox.Show("You have not specified the paths completely!");
  
      }
      else
      {
          Tabitem2.Visibility = Visibility.Visible;
          Tabcontrol1.SelectedIndex = 1;
  
      }
  }
  </code></pre>
  
  <p>I tried to add breakpoint to examine the immediate values. When either one of the Textbox.Text is empty, the immediate value is "" respectively. Is there anything wrong with my code?</p>