title: change visibility with expression in Microsoft Report rdlc
body: <p>i need to change the visibility of a image in my report. For that i'm using an expression.
  For default i want it set to true, and when i'm printing i set the parameter to false so the image doen't show up. Problem is, image never show's up.</p>
  
  <p><code>=CBool(Parameters!ShowImage.Value)</code></p>
  
  <p>c# (the parameter i send when creating the report)</p>
  
  <pre><code>p[27] = new ReportParameter("ShowImage", "True");
              this.reportViewer1.LocalReport.SetParameters(p);
  </code></pre>
  
  <p>Thanks in advance</p>