Add Content types to List or Library in Sharepoint 2010 programmatically

private void AddContentTypesToLibrary(SPList list, SPWeb oWeb)

        {

            list.ContentTypesEnabled = true;

            SPContentTypeCollection ctypecoll = oWeb.ContentTypes;

            foreach (SPContentType ctType in ctypecoll)

            {

            

                    if (list.ContentTypes[ctType.Name] == null)

                    {

                        //ctType.Hidden = true;

                        list.ContentTypes.Add(ctType);

                        

                    }

            

            }

        }