using CMS.Forums;

using CMS.CMSHelper;

using CMS.SiteProvider;

...

        // Create new forum group info

        ForumGroupInfo fgi = new ForumGroupInfo();

        // Set properties

        fgi.GroupName = "CustomForumGroup";

        fgi.GroupDisplayName = "Custom forum group";

        fgi.GroupSiteID = CMSContext.CurrentSiteID;

        fgi.GroupAuthorDelete = true;

        fgi.GroupAuthorEdit = true;

        fgi.GroupDisplayEmails = true;

        // Save object to database

        ForumGroupInfoProvider.SetForumGroupInfo(fgi);

        // Get Forum group object

        fgi = ForumGroupInfoProvider.GetForumGroupInfo("CustomForumGroup", CMSContext.CurrentSiteID);

        // If forum group exists

        if (fgi != null)

        {

            // Create new forum object

            ForumInfo fi = new ForumInfo();

            // Set properties

            fi.ForumName = "CustomForum";

            fi.ForumDisplayName = "Custom forum";

            fi.AllowAccess = SecurityAccessEnum.AllUsers;

            fi.AllowAttachFiles = SecurityAccessEnum.AuthenticatedUsers;

            fi.AllowPost = SecurityAccessEnum.AllUsers;

            fi.AllowReply = SecurityAccessEnum.AllUsers;

            fi.AllowSubscribe = SecurityAccessEnum.AllUsers;

            fi.ForumGroupID = fgi.GroupID;

            fi.ForumOpen = true;

            fi.ForumModerated = false;

            fi.ForumThreads = 0;

            fi.ForumPosts = 0;

            fi.ForumSiteID = fgi.GroupSiteID;

            // Save new forum to database

            ForumInfoProvider.SetForumInfo(fi);

        }