title: does not contain a defination for 'Show' and no accessible extension method 'Show' accepting a frist argument of type 'Page'
body: <p>due to my less knowledge, i cant solve my small problems,  my books can help me too. therefore. I need your help and appreciate it, ofcourse too!</p>
  
  <p>Problem: i just wanna jump from one page to the next page! but the Show() and Close() methods show the exactly same error. Perhaps something is missing in Registration Page? </p>
  
  <p><a href="https://i.stack.imgur.com/hSVey.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hSVey.jpg" alt="enter image description here"></a></p>
  
  <p>Thanks alot for your reply!</p>