title: check if a string contains a numeric value
body: <p>I am trying to check if a string contains a numeric value, if it doesnt return to a label if it does then I would like to show the main window. How can this be done?</p>
  
  <pre><code>If (mystring = a numeric value)
              //do this:
              var newWindow = new MainWindow();
              newWindow.Show();
  If (mystring = non numeric)
              //display mystring in a label
              label1.Text = mystring;
  
  else return error to message box
  </code></pre>