title: Convert hex value string to Binary string
body: <p>I want to convert <code>000000000000000117c80378b8da0e33559b5997f2ad55e2f7d18ec1975b9717</code> hex value to it's binary format (to a string of binary), but following code throws an exception if either value being too big or too small. Why is that?</p>
  
  <pre><code>Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
          Dim binstring As String
          Dim hexstring As String = "000000000000000117c80378b8da0e33559b5997f2ad55e2f7d18ec1975b9717"
          binstring = Convert.ToString(Convert.ToInt32(hexstring, 16), 2)
  
          T5.Text = binstring
      End Sub
  </code></pre>