title: Check if listbox contains textbox
body: <p>I know I could use <code>.FindString</code> for this but for some reason it is not working.</p>
  
  <p>Basically,if listbox items contains just a PART of textbox text,it does action.</p>
  
  <p>Here's the example of not-working code :</p>
  
  <pre><code>Dim x As Integer = -1
          x = ListBox1.FindString(TextBox1.Text)
          If x &gt; -1 Then
              'dont add
              ListBox2.Items.Add("String found at " &amp; x.ToString)
          Else
  
          End If
  </code></pre>