How to pass query string parameter to ssrs reports from report viewer control

In my 2012 asp.net web form application, one of the aspx pages that contains asp.net report viewer control is codedin its Page_Load event handler as below to call remote ssrs (SQL Server 2012) reports using property ReportPath.

I have 2 questions:

Question 1: If I want to pass one more query string via property ReportPath, for example deviceId=1234, how can I do so?

protected void Page_Load(object sender, EventArgs e)        {                ....                ReportViewer1.ServerReport.ReportPath = _myReportPart; // I want to pass more query string here like deviceId=1234. How can I do so?                ReportViewer1.ServerReport.ReportServerUrl = new Uri(myReportServerUrl);            }        }

Question 2: on remote ssrs rdl reports, how can reports consume/extract that extra query string?

Thank you.