title: Multiple debug and release configuration options in Visual Studio
body: <p>There are multiple alternatives for "release and debug" configuration in visual studio, I would like to know if they serve the same purpose. </p>
  
  <p>1) Option 1: In the Visual Studio toolbar</p>
  
  <p><a href="https://i.stack.imgur.com/eaAW5.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/eaAW5.jpg" alt="Visual Studio Menu"></a></p>
  
  <p>2) Option 2: In the web.config file</p>
  
  <p><a href="https://i.stack.imgur.com/ZHqt0.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ZHqt0.jpg" alt="web.config"></a></p>
  
  <p>3) Option 3: In the project properties window</p>
  
  <p><a href="https://i.stack.imgur.com/POha2.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/POha2.jpg" alt="enter image description here"></a></p>
  
  <p>4) Option 4: In the publish site configuration window</p>
  
  <p><a href="https://i.stack.imgur.com/ovAYF.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ovAYF.jpg" alt="enter image description here"></a></p>
  
  <p>Is not one of these configuration options enough to deploy an application? Are all of them required? what are the differences? </p>