title: Set text in an existing contentcontrol in word 2010 with c# and VSTO
body: <p>I've been looking and googling around for 4h to find a solution for my problem.</p>
  
  <p>I'm trying to set the text of an defined rich text content control.
  For test purposes i defined just one content control (rich text) in the document where i would like to change the text.</p>
  
  <pre><code>var docx = Application.Documents.Open(@"D:\BaseDocs\Test.docx");
  var all = GetAllContentControls(docx); // Returns all content controls in active document
  var one = all.First(); // Select first one --&gt; works
  ((RichTextContentControl)one).Text = "Test" //Trying to set text --&gt; invalid cast exception
  </code></pre>
  
  <p>I can't set the value of this predefined content control. Any help is really appreciated.</p>