can you please explain in details

as I have used a shared datasource which I have brought from my project.

vandana

That's fine I have a dropdownlist and I can select multiple values but full report is being generated not specific to those values.

look I want to generate report based on the selection of the drop down list(having district names)

in the data set I have written the query

Select districtname,districtcode from district WHERE...

what if i have only one parameter.