title: Missing Reference when using the Excel Library with Microsoft visual studio 2012
body: <p>I am using Visual studio 2012 with MySql database .. I am trying to generate simple report using Forms. When click on button the reports will generate in EXCEL sheet. The problem that I am facing is using this library:  <code>using Excel = Microsoft.Office.Interop.Excel;</code>   when I used it says :     <strong>One or more types required to compile a dynamic expression cannot be found. Are you missing a reference?</strong><br>
  <img src="https://i.stack.imgur.com/a66KC.png" alt="enter image description here"></p>
  
  <p>as shown in the figure  !!</p>
  
  <p>Please Any Help ??
  Thanks in Advance </p>