title: DateTime TryParse problem
body: <pre><code>string date = txtWorkingDate.Text;
              DateTime dateTime = DateTime.MinValue;
  
              if (DateTime.TryParse(date, out dateTime))
              {
                  args.IsValid = true;
              }
              else
                  args.IsValid = false;
  </code></pre>
  
  <p>txtWorkingDate.Text is like "dd.MM.yyyy" becouse of this validateion is always false if date is not like "dd.MM.yyyy". How c an i check types of date like "dd.MM.yyyy", "MM/dd/yyyy" becouse are all valid.</p>