title: SQL Server Reporting Services - Set default value for multi-value report parameter
body: <p>I have a report in SSRS and one of the parameters I use is Cities.  The user can select from a list of cities to pull the report for that location, or multiple locations.  My datset is simply a select * from tblCities.  When I run the report, I do see that one of the options is "Select All."  But, I'm wondering - is there a way I can get this "Select All" option as the default value, so that by default all cities are selected?  </p>
  
  <p>And, along those lines, but a separate question - is it possible to make this drop-down optional?  I have tried the  allow NULLS checkbox, but for multi-value parameters, it seems SSRS does not allow this.</p>
  
  <p>FYI - I have only begun using SSRS; know very little about it.</p>