Hi Matt ,

If you want to configure the DACL of the directory to allow everyone on
your machine to full control this folder, then you are looking at the
correct parameter. The "DirectorySecurity Class" below contains the sample
code regarding how to setup the DirectorySecurity object:
http://msdn2.microsoft.com/en-us/library/system.security.accesscontrol.direc
torysecurity.aspx

The link below also contains some ACL programming stuff:
"How To Program ACLs"
http://pluralsight.com/wiki/default.aspx/Keith.GuideBook/HowToProgramACLs.ht
ml

However, if you want to share this directory with others from remote
computer through LAN file share, there is another story.

In file share, there are 2 stages of access check: DACL access check and
file share permission check. Only account authentication can pass these 2
permission sets stages, can it successfully access the shared files.

Sharing Permission set can be configured through "Permissions" button in
"Sharing" tabpage in folder property dialog, while NTFS DACL Permission set
can be configured through button in "Security" tabpage in folder property
dialog.

.Net contains build-in support to configure the DACL permission of
directories/files and I have shown you the sample code snippet in the first
paragraph. To configure the share permission, there is no build-in support.
We have to p/invoke NetUseAdd Win32 API for this task. My original reply
below and the codeproject article demonstrates this idea with code snippet
in C#:
http://groups.google.com/group/microsoft.public.platformsdk.security/msg/063
d7b08b29e5642?hl=zh-CN&
"How to create a file share using .NET framework"
http://www.codeproject.com/dotnet/pinvokeaddshare.asp

Finally, the article below contains very detaild ACL programming in
.Net2.0, it should be informative if you are curious about security
programming in .Net:
http://www.codeproject.com/csharp/accessctrl3.asp

Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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