title: Getting database connection error in three tier architechture in mvc 3
body: <p>I'm trying to implement basic three tier architecture with mvc 3. but getting an error while running the solution ( showing no error while building the solution). The organization of my projects &amp; error message can be seen in the attached image.<img src="https://i.stack.imgur.com/ILp8c.png" alt="enter image description here"></p>
  
  <p>Please help.</p>
  
  <p>OK guys, This is an update for.</p>
  
  <p>As specified by some comments, I copied the original connection string from app.config to my web.config file &amp; getting this error as shown in the image.
  <img src="https://i.stack.imgur.com/56XGm.png" alt="enter image description here"></p>
  
  <p>I tried to search a lot but no clue! Any help will be highly appropriated.</p>