Illegal characters in the path

Epicor ERP 10
, , , ,
1

Hello dears, please can somebody help I cant see the error here!

Private Sub SaveReport(ByVal vORderNum As String, ByVal vGUID As String)
    Dim Client As New system.net.WebClient()

    	Dim url As String = "192.168.0.79/ReportServer/Pages/ReportViewer.aspx?%2fEpicor10Test%2fCustomWork%2fSalesOrderAcknowledgement%2fSOForm&rs:Format=PDF&rs:Command=Render&TableGuid=" & vGUID
	Client.UseDefaultCredentials = True
	msgbox(vORderNum)
		Client.DownloadFile(url,"C:\temp\" &  vORderNum & ".pdf")
  End Sub
2

Might need to be "C:\\temp\\"

Or @"C:\temp\"