Try this:
string reportServerName = @"http://hn-sd-0100-wk/ReportServer_SQL2008R2";
string reportFolder = @"/ReportProjectContact/";
string reportName = "ReportContact";
ReportViewer1.ProcessingMode = ProcessingMode.Remote;
ServerReport serverReport;
serverReport = ReportViewer1.ServerReport;
serverReport.ReportServerUrl = new Uri(reportServerName);
serverReport.ReportPath = reportFolder + reportName;
I have tested it and work in asp.net.