Another developer reported the same problem a couple of weeks ago. He found in the Internet that the Indexing service might cause security exceptions with .NET memory streams (used in SavetoString), so he disabled it on the client side and now SaveToString works for him.

A situation where Flowchart.NET could need permission higher than the default security permissions is when you have controls hosted in ControlHost nodes. While saving them, FC.NET tries to access the control assemblies to get their version information, and that needs Reflection and disk I/O permissions assigned to it.

You can assign more permissions to Flowchart.NET like this:

Open Control panel
Open Administrative tools
Open Microsoft .NET Framework 1.1 Configuration
In the tree on the left expand Runtime Security Policy
Choose Machine
Choose Code Groups\All Code\
Select the zone from which you are running your application, e.g. Intranet
or Internet (look the IE status bar icons to know which zone to choose)
you can either change the settings for the zone (all .NET components
running in it) or ...
Right click the zone and choose duplicate
Rename the copy to fc.net or something similar
Open the copy properties dialog, go to the Membership conditions tab
For condition choose 'strong name' and import the flowchart.net.dll
assembly
Go to the Permission Set tab and choose 'Everything'
choose ok etc. until the settings are applied
restart all IE instances and reload the application.

But that must be done on each client PC.

Stoyan

Ok sorry, indeed I could make the list more legible...

Hi,

Please use SaveToFile to save the diagram on the server and email it to me. Our developer will trace through the flowchart's code to see what exactly requires more permissions.

Thanks,
Stoyan