Build failed due to validation errors in .dbml

If you ever used Linq 2 Sql you probably encountered this error (if you haven’t – don’t worry, you will  

Error 180 Build failed due to validation errors in .dbml.  

Open the file and resolve the issues in the Error List, then try rebuilding the project.

Luckily there is a workaround to this issue: 

1) open Visual Studio Command Prompt and run Visual Studio with /resetskippkgs parameter.
devenv /resetskippkgs

Unfortunately it doesn’t work all the times, so another workaround that you can try is to edit project file:

1) open project file in text editor
2) remove (or comment out) following lines: 

   1: <ItemGroup> 

   2:      <Service Include="{3259AA49-8AA1-44D3-9025-A0B520596A8C}" /> 

   3: ItemGroup>

3) You may have to restart visual studio at this point.

And that’s it