How to pass server / domain credentials when accessing SSRS report through SSRS web service programmatically?

I am trying to render an SSRS report located on my remote report server in my ASP.NET MVC 4 application through a Reporting Services web service programmatic.

how can i send the server (windows / domain credentials) at runtime?

tried below but didn't have time.

ReportingService2010 service = new ReportingService();
service.Credentials = new System.Net.NetworkCredential("username", "password");
service.Url = "http://MyReportServer/ReportServer/";