title: Iterate over columns of a report to dynamically show/hide them?
body: <p>I want to try and implement a parameter which will allow users to dynamically choose which columns are going to be shown in a report. An idea is to create a multiple value parameter which has column names. After user hit View Report I want to try iterate over columns and selected values to join visibility. </p>
  
  <p>How I can iterate over columns inside a tablix?</p>
  
  <p>How I can iterate over multiple values of a parameter, so I can find if some value is selected or not?</p>
  
  <p>I am using MS SQL Reporting Services 2012.</p>