title: Converting a String to a Date -> FormatException
body: <p>Im desperately trying to convert the following String to a Date.
  I did research on how to do this, but was not able to do it successfully.</p>
  
  <p>So basically, I have two Datepicker-Controls on my form.
  When the form is being saved, I always want to have the Date from Control #1, but keep the Time from Control #2.
  I am trying as following:</p>
  
  <pre><code>Dim strDatum As String = dtpDatum.Value.ToString() '= 03.01.13 00:00:00
  Dim strStart As String = dtpVon.Value.ToString()   '= 23.01.13 10:39:01
  Dim sStartDatum = Strings.Left(strDatum, 8) &amp; " " &amp; Strings.Mid(strStart, 10, 9) '= 03.01.13 10:39:01
  
  'here I'm trying to convert my new String to a Date and assign it to my a parameter
  .Parameters("@dStartZeit").Value = DateTime.ParseExact(sStartDatum, "DD.MM.YY HH:mm:ss", New Globalization.CultureInfo("en-US"))
  </code></pre>
  
  <p>I get an "FormatException" when executing my query.</p>
  
  <p>What am I doing wrong here?</p>
  
  <p>Thanks!</p>