title: how to show login form on front & Mainform Behind Login Form?
body: <p>In my winform application; I have login form and main form.</p>
  
  <p>When I run program I want the login form on top and main form behind it.</p>
  
  <p>One more thing is until I do not login properly with username and password, the  main form should not be accessible and only the login form should accessible.</p>
  
  <p>My Language is C#.Net.</p>
  
  <p>Please provide idea on how to achieve this?</p>