Sometimes we found frustrating problem in Crystal Report. This error is shown below:

Access is denied.
System.Runtime.InteropServices.COMException: Access is denied.

And we spent many hours to resolve this problem. Now, in this tutorial, I will show you how to fix it and hope it helps.

First, you need to check the permission. I mean the asp.net user already had the permission to the .rpt file. This file is put in the directory specified by the environment variable “TMP” which can be viewed in code by using this method:

System.Environment.GetEnvironmentVariable("TMP")

Giving the ASP.NET user Full Control to this directory will work, but what I really wanted was for Crystal Reports to use a directory that I specified in the web.config file. To do this I set the environment variable, loaded the ReportDocument, and changed the environment variable back.

...

'Get the Crystal Reports Temp directory from web.config
Dim TempRoot As String = ConfigurationManager.AppSettings("CRTempDir")

Dim oldTmp As String = System.Environment.GetEnvironmentVariable("TMP")
System.Environment.SetEnvironmentVariable("TMP", TempRoot)

Dim rpt as New ReportDocument()
rpt.Load("myReport.rpt")

System.Environment.SetEnvironmentVariable("TMP", oldTmp)

...

'Be sure to call this as it will delete your temporary .rpt file
rpt.Dispose()

When you run your web page, Crystal Reports will create a temporary .rpt file using the name of your .rpt and adding a Guid to the end of it. Crystal Reports also writes a .tmp file for some reason. Once Dispose() is called on the ReportDocument both of these temp files will be deleted.

I hope in this tutorial will solve your problem. Please visit our site at http://www.asphostportal.com if you need Crystal Report 2008 or Crystal Report 2010 hosting. If you have further question, please feel free to email us at [email protected].

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