Read only or hidden report parameters in Reporting Services

I have 3 parameters in my report page. I am setting 2 parameters in default from my aspx application for this report. So i dont want to show these 2 parameters when i execute my report. I tried rc:parameters = false in querystring which is just hiding the whole parameters. But is there a way to make the other 2 parameters readonly or hidden and show 1 parameter to take input when i execute the report.Try going to Report Manager portal, editing the report parameters, and setting visibility to false.
Alternatively, I think you can also do this if you remove the name of the parameter in the report designer.sql