visual studio report

I want to prompt the user to select from a list of values provided by another query. The selected value should be the filter for the main report query. What I have done so far does not acknowledge the selected value. The report displays all rows in the query even though I have selected a parameter
Report Data
-ReportParameter1
  Prompt=School
  DataType=Text
  Allow Multiple values
  Available values-get from query
    Dataset=school,
    Value=school,
    label=school
  No Default
 DataSet1
  Filter [school]=Parameters!ReportParameter1.Value(0)

What else should I do so the report will use the selected value to filter the results?