Render and open SSRS report to PDF in another window (instead of downloading)

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C#

SSRS

reporting-services

I am having an issue rendering an SSRS report to PDF in MS Edge. It presents a new window as desired but instead of opening the SSRS report in PDF, it downloads the file directly and not showing the report.

What I have tried:

string pdfReportURL = reportServer + "/Pages/ReportViewer.aspx?%2fOps%2fCPM%2fCompleted+Flow+Sheet+Activities&PatientID=" + PatientId + "&CalendarDate=" + dateOfServiceString + "&rs:Command=Render&rs:Format=PDF&rs:ClearSession=True";


ScriptManager.RegisterStartupScript(this, this.GetType(), "newWindow", String.Format("window.open('{0}','_blank',resizable=1,scrollbars=1);", pdfReportURL), true);

If this is impossible to fix, how can I open and render SSRS to PDF in another window using IFrame