Retrieving SSRS Report Snapshot Programmatically and Display it in a Report Viewer.

simply I want to retrieve a ssrs report snapshot and view it in a report viewer so I used this code

string urlReportServer = "http://workstation/ReportServer_WORKSERVER";
rptViewer.ProcessingMode = ProcessingMode.Remote;
rptViewer.ServerReport.ReportServerUrl = new Uri(urlReportServer);
rptViewer.ServerReport.ReportPath = "/main";
rptViewer.ServerReport.HistoryId = "4F1F8306-7493-49EC-8EA1-72F217F8E568";// which I got from the ReporServer database.
rptViewer.ServerReport.Refresh();

then I got this error 

The parameter value provided for 'snapshotID' does not match the parameter type. (rsParameterTypeMismatch)

• String was not recognized as a valid DateTime.

although I run the snapshot from the url normally and everything is working fine.