Invalid report file path.

Question

I have a .NET C# Web App with embedded Crystal Reports (version 10.2.3600) running on Windows Server 2003 Standard Edition (Service Pack 2). Every few days the reports generate errors and we have to restart IIS to get them to run again. I cannot figure out what is causing the system to lock up. The error I am getting is 'Invalid report file path.' Do you know what would cause this to happen?

Answer 1

this is the C# code we used to fix this issue:
private ReportDocument CrystalRpt;
    //Declaring these here and disposing in the Page_Unload event was the key.  Then the only other issue was the
    // limitations of Crystal 11 and simultaneous access to the rpt file.  I make a temp copy of the file and use that in the
    // method.  Then I delete the temp file in the unload event.
    private ReportDocument mySubRepDoc;
    private ReportClass ReportObject;
    private string tmpReportName;
    protected void Page_UnLoad(object sender, EventArgs e)
Try
            CrystalReportViewer1.Dispose();
            CrystalReportViewer1 = null;
            CrystalRpt.Close();
            CrystalRpt.Dispose();
            CrystalRpt = null;
            mySubRepDoc.Close();
            mySubRepDoc.Dispose();
            mySubRepDoc = null;
            ReportObject.Close();
            ReportObject.Dispose();
            ReportObject = null;
            GC.Collect();
            File.Delete(tmpReportName);
catch
{ ...Error Handler }
protected void Page_Load(object sender, EventArgs e)
        CrystalRpt = new ReportDocument();
        ConnectionInfo CrystalConn = new ConnectionInfo();
        TableLogOnInfo tblLogonInfo = new TableLogOnInfo();
        ReportObject = new ReportClass();
        TableLogOnInfo CrystalLogonInfo = new TableLogOnInfo();
        ParameterField CrystalParameter = new ParameterField();
        ParameterFields CrystalParameters = new ParameterFields();
        ParameterDiscreteValue CrystalParameterDV = new ParameterDiscreteValue();
        TableLogOnInfo ConInfo = new TableLogOnInfo();
        SubreportObject mySubReportObject;
        mySubRepDoc = new ReportDocument();
        //Report name is sent in querystring.
        string ReportName = Request.QueryString["ReportName"];
        // I did this because Crystal 11 only supports 3 simultaneous users accessing the report and 
        // we have up to 60 at any time.  This copies the actual rpt file to a temp rpt file.  The temp rpt
        // file is used and then is deleted in the Page_Unload event
        Random MyRandomNumber = new Random();
        tmpReportName = ReportName.Replace(".rpt", "").Replace(".ltr", "") + MyRandomNumber.Next().ToString() +".rpt";
        File.Copy(ReportName, tmpReportName, true);
        CrystalRpt.Load(tmpReportName);