Hide Content types in the sub Folders in Sharepoint 2010

private void ChangeOrHideContentTypesInALibrary(SPList list)

        {

            //************ start :hiding content types for working document list subfolders ***************//

            SPFolderCollection folderCol = list.RootFolder.SubFolders;

            foreach (SPFolder folder in folderCol)

            {

                HideContentTypeByFolder(folder, list);

            }

            //************ start :hiding root level content types ***************//

            orderedContentTypes = new List<SPContentType>();

            list.RootFolder.UniqueContentTypeOrder = null;

            list.RootFolder.Update();

            foreach (SPContentType ct in list.RootFolder.ContentTypeOrder)

            {

                if (ct.Name.Contains("Select Content Type"))

                {

                    ct.Hidden = true;

                }

                if (ct.Name.Contains("Select Content Type")) // ||  ct.Group.Contains("Lending Processes"))

                {

                    //ct.Hidden = false;

                    orderedContentTypes.Add(ct);

                }

            }

            if (orderedContentTypes != null && orderedContentTypes.Count > 0)

            {

                if (orderedContentTypes.Count > 0)

                {

                    orderedContentTypes.Reverse();

                }

                list.RootFolder.UniqueContentTypeOrder = orderedContentTypes;

                list.RootFolder.Update();

            }

        }

        private void HideContentTypeByFolder(SPFolder folder, SPList documentLibrary)

        {

            orderedContentTypes = new List<SPContentType>();

            int i = 0;

      //foreach (SPContentType ct in documentLibrary.ContentTypes) // u can use one of them

            foreach (SPContentType ct in folder.ContentTypeOrder)

            {

                if (ct.Group.Contains("Collab " + folder.Name))

                {

                    ct.Hidden = false;

                    orderedContentTypes.Add(ct);

                    //orderedContentTypes[i].Hidden = false;

                }

                if (ct.Name.Contains("Select Content Type"))

                {

                    orderedContentTypes.Add(ct);

                }

                i++;

            }

            if (orderedContentTypes != null && orderedContentTypes.Count > 0)

            {

                folder.UniqueContentTypeOrder = orderedContentTypes;

                folder.Update();

            }

        }