Add / Delete content type to list programmatically

Hi Friend,

Here is sample code to add / delete content type in list / library programmatically.Also i will create the site column and add into custom content type.

 public override void FeatureActivated(SPFeatureReceiverProperties properties)
        {
            try
            {
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    using (SPSite spCurrentSite = properties.Feature.Parent as SPSite)//new SPSite(SPContext.Current.Site.Url))
                    {
                        using (SPWeb spCurrentweb = spCurrentSite.OpenWeb())
                        {
                            //Delete existing content type
                             spCurrentweb.AllowUnsafeUpdates = true;
                            SPContentType newwvOCSDoc = spCurrentweb.ContentTypes.Cast<SPContentType>().FirstOrDefault(c => c.Name == "wvOCSDoc");

                            if (newwvOCSDoc != null)
                            {
                                newwvOCSDoc.Delete();
                            }

                            //Delete existing site columns

                            SPField CountryCode= spCurrentweb.Fields.Cast<SPField>().FirstOrDefault(f => f.StaticName == "wvCountryCode");
                            if (CountryCode!= null)
                            {
                                CountryCode.Delete();
                            }
                         
                            SPField ProjectID = spCurrentweb.Fields.Cast<SPField>().FirstOrDefault(f => f.StaticName == "wvProjectID");
                            if (ProjectID != null)
                            {
                                ProjectID.Delete();
                            }

                            //Now add new content type in site

                            SPContentType myContentType = new SPContentType(spCurrentweb.ContentTypes["Document"], spCurrentweb.ContentTypes, "wvOCSDoc");

                            myContentType.Group = "Custom Content Types"; //Group name

                            //Create new Site Columns
                            spCurrentweb.Fields.Add("wvCountryCode", SPFieldType.Text, false);
                            spCurrentweb.Fields.Add("wvProjectID", SPFieldType.Text, false);
                          
                            SPFieldLink Author = new SPFieldLink(spCurrentweb.Fields["Author"]);
                            myContentType.FieldLinks.Add(Author);

                            SPFieldLink wvCountryCode = new SPFieldLink(spCurrentweb.Fields["wvCountryCode"]);
                            myContentType.FieldLinks.Add(wvCountryCode);

                            SPFieldLink wvProjectID = new SPFieldLink(spCurrentweb.Fields["wvProjectID"]);
                            myContentType.FieldLinks.Add(wvProjectID);

                            spCurrentweb.ContentTypes.Add(myContentType);
                            myContentType.Update();

                           spCurrentweb.AllowUnsafeUpdates = false;
                        }
                    }
                });
            }

            catch (Exception ex)
            { }
        }
Now you can see the "wvOCSDoc" content type in site content type section of your site.