Remove web part from web part gallery

Sometimes you need to prevent users to add your web part to pages. You can do this simple when deactivate a feature. Removing the web part is based on assembly name.

public override void FeatureDeactivating(SPFeatureReceiverProperties properties) 
{
    string assemblyName;        
    assemblyName = System.Reflection.Assembly.GetExecutingAssembly().FullName;

    using (SPSite site = (SPSite)properties.Feature.Parent)
    {
        using (SPWeb web = (SPWeb)site.OpenWeb())
        {
            if (web.CurrentUser.IsSiteAdmin)
            {
                List<int> toDelete = new List<int>();
                SPList list = site.GetCatalog(SPListTemplateType.WebPartCatalog);

                foreach (SPListItem item in list.Items)
                {                        
                    if (item["WebPartAssembly"].ToString() == assemblyName)                        
                    {
                        toDelete.Add(item.ID);
                        break;
                    }
                }

                foreach (int i in toDelete)
                {
                    SPListItem item = list.GetItemById(i);
                    item.Delete();
                }

                list.Update();
            }
        }
    }
}