Good morning,

I am trying to complete the example on page 129 and I am receiving the following error:

An unhandled exception of type 'System.Security.SecurityException' occurred in mscorlib.dll

Additional information: Request for the permission of type System.Security.Permissions.FileIOPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

My code reads:

        Dim subFolders() As DirectoryInfo
        subFolders = New DirectoryInfo("c:\").GetDirectories
        [ERROR OCCURING ON LINE ABOVE]

        Dim subFolder As DirectoryInfo

        For Each subFolder In subFolders
        lstData.Items.Add(subFolder.FullName)

        [remainder of code omitted]

Can someone please assist and tell me what this error means?

Thanks in advance.

Eric

You should declare namespace outside of the class

On the top of your code, add this line

imports system.io

and you should also have a next corresponding to your For Each statement

It is probably due to the fact that your project is stored, and consequently running, on a network drive. So when it tries to reach a local file of your machine, you get a security error.
Try to move your solution on your local disk.