title: show/hide columns in SSRS report 2012 based on Multiselect parameter
body: <p>i have been trying to hide/show columns within my tablix based on multi value parameter , but whenever i am plugging in the expression in the column visibility properties it is not showing what i select from the parameter and hide what is not select. 
  Here is the expression: 
  <code>=IIF(InStr(JOIN(Parameters!parameter.Value,", "),"value"),false,true)</code></p>
  
  <p>any help???</p>