Question

How do I set group policies in AD? I’m able to create my OU but i also need to attach group policy linking to it. So this is what i have so far.

 string strOU = "OU=test454545,OU=Clients,OU=Clients,DC=domain,DC=net";
        GPMGMTLib.GPM gpm = new GPMGMTLib.GPM();
        GPMGMTLib.GPMConstants gpc = gpm.GetConstants();
        GPMGMTLib.GPMDomain gpd = gpm.GetDomain(Environment.GetEnvironmentVariable("USERDNSDOMAIN"), "", gpc.UseAnyDC);  
        GPMGMTLib.GPMSOM gpSom = gpd.GetSOM(strOU);

        GPMGMTLib.GPMGPO gpo = gpd.CreateGPO();
        gpo.DisplayName  = "TestOutCome";
        gpSom.CreateGPOLink(-1,gpo);

This still doesn’t create the GPO link, but all i want to do is link an existing GPO, anyt thoughts? And thanks for the help.

Okay getting closer, this just created a policy doesn’t actually link an existing one…

 string strGPO = "Default Security with web access";
        string strOU = "OU=test454545,OU=Clients,OU=Clients,DC=domain,DC=net";
        GPMGMTLib.GPM gpm = new GPMGMTLib.GPM();
        GPMGMTLib.GPMConstants gpc = gpm.GetConstants();
        GPMGMTLib.GPMDomain gpd = gpm.GetDomain(Environment.GetEnvironmentVariable("USERDNSDOMAIN"), "", gpc.UseAnyDC);
        GPMGMTLib.GPMSearchCriteria searchOBJ = gpm.CreateSearchCriteria();
        searchOBJ.Add(gpc.SearchPropertyGPODisplayName, gpc.SearchOpEquals, strGPO);
        GPMGMTLib.GPMGPOCollection objGPOlist = gpd.SearchGPOs(searchOBJ);
        GPMGMTLib.GPMSOM gpSom = gpd.GetSOM(strOU);
        GPMGMTLib.GPMGPO gpo = gpd.CreateGPO();
        gpSom.CreateGPOLink(-1,gpo);

Update and WORKING:

This is for linking existing GPO’s to OU’s using C#
1) install http://www.microsoft.com/downloads/en/confirmation.aspx?FamilyID=0a6d4c24-8cbd-4b35-9272-dd3cbfc81887
2) Reference gpmgmt.dll (found in the install directory)
3) You might have to install .Net 1.1
4) Add References to VS
5) add using GPMGMTLib; using GPOADMINLib; to project

            string strGPO = "Default Security with web access";
        string strOU = "OU=test454545,OU=Clients,OU=clients,DC=domainh,DC=net";
        GPMGMTLib.GPM gpm = new GPMGMTLib.GPM();
        GPMGMTLib.GPMConstants gpc = gpm.GetConstants();
        GPMGMTLib.GPMDomain gpd = gpm.GetDomain(Environment.GetEnvironmentVariable("USERDNSDOMAIN"), "", gpc.UseAnyDC);
        GPMGMTLib.GPMSearchCriteria searchOBJ = gpm.CreateSearchCriteria();
        searchOBJ.Add(gpc.SearchPropertyGPODisplayName, gpc.SearchOpEquals, strGPO);
        GPMGMTLib.GPMGPOCollection objGPOlist = gpd.SearchGPOs(searchOBJ);
        GPMGMTLib.GPMSOM gpSom = gpd.GetSOM(strOU);
        GPMGMTLib.GPMGPO gpo = gpd.CreateGPO();
        gpSom.CreateGPOLink(-1,objGPOlist[1]);

Answer 1

Take a look at this link

It contains a lot of sample scripts, you will need to add a reference (COM) to GPO Admin 1.0 Type Library from GPOAdmin.dll.

There is a similar issue discussed here with a sample script in C#

EDIT:

Reference gpmgmt.dll as COM interop and use the code as below:

Public Function CreateAndLinkGPO(ByVal strDomain As String, ByVal strOU As String, ByVal strGPOName As String)
    Dim gpm As New GPM()
    Dim gpmConst As GPMConstants = gpm.GetConstants()
    Dim domain As GPMDomain = gpm.GetDomain(strDomain, "", gpmConst.UseAnyDC)
    Dim som As GPMSOM = domain.GetSOM(strOU)

    'create new GPO
    Dim gpo As GPMGPO = domain.CreateGPO()
    gpo.DisplayName = strGPOName 

    'create link to OU
    som.CreateGPOLink(-1, gpo)

    CreateAndLinkGPO = gpo
End Function

This is in VB.NET, but can be easily ported to C# posted by a MSFT poster from here. I think the key is .CreateGPOLink, GPMSOM is your OU (Retrieves the IGPMSOM interface that represents the domain or the organizational unit (OU) at the specified path.)