title: Can't get Microsoft.Office.Interop reference to work
body: <p>I have a C# winforms app and I am simply trying to open an Excel sheet. When I try to add a reference to Microsoft.Office.Interop, the "Office" part is red and says "Can't resolve symbol 'Office'". </p>
  
  <p>When I attempt to build, the error is:</p>
  
  <pre><code>The type or namespace name 'Office' does not exist in the namespace 'Microsoft' 
      (are you missing an assembly reference?)
  </code></pre>
  
  <p>I have Office 2012 installed, and I think I have the Primary Interop Assemblies installed... but I'm not positive. </p>
  
  <p>I know that this should be so easy, but I've been looking around for an answer to this for almost an hour and just can't figure it out. Thanks in advance!</p>