how to write query for three parameters

Hi,

I have a reports form. Now, i need to show three parameters in a report(Excel or .txt).
I need to write a query for these three paramters. 
Parameters should be- @Countryid, @Startdate, @Enddate
We can't use procedures. I need to write a query and build that. And i should use that query in selected_indexchanged event

Thanks in advance.