SSRS 2008 Report String Filter with LIKE operator

goto the Filters in Tablix or Group,
Add the filter,
select Expression as your Fieldname to be filtered on,
select operator LIKE
in value when you click fx button it will show you options in new window
click parameters and select the parameter you created in the report.
you'll see =Parameters!ParameterName.Value
change that to = "*" & Parameters!ParameterName.Value & "*"