title: Build C# in VSCode not working
body: <p>I'm trying to build my C# (WPF) project, which I originally generated in Visual Studio 2017 in VSCode. If I open a command prompt and build the project with <code>C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe .\[Name]\[Name].csproj /t:Rebuild /p:Configuration=Debug</code></p>
  
  <p>the build succeeds and the program runs as expected, but with the following message (not a warning nor an error):</p>
  
  <blockquote>
    <p>Project file contains ToolsVersion="15.0". This toolset may be unknown or missing, in which case you may be able to resolve this by installing the appropriate version of MSBuild, or the build may have been forced to a particular ToolsVersion for policy reasons. Treating the project as if it had ToolsVersion="4.0".</p>
  </blockquote>
  
  <p>But when I try to run and build in VSCode (Start with Debugging (F5)), the build fails. Also, VSCode shows every XAML-Element I referenced in code as undefined:</p>
  
  <blockquote>
    <p>(The name '[Button/Label/TextBox/etc.]' does not exist in the current context [Name]</p>
  </blockquote>
  
  <p>What do I need to define in the tasks.json and launch.json to make VSCode build my project?</p>