UpdatePageTypeWithGuidProperty

public static void UpdatePageTypeWithGuidProperty()
        {
            var pageTypesList = PageType.List();
            foreach (PageType pt in pageTypesList)
            {
                var pd = GetNewPageDefinition();
                pd.PageTypeID = pt.ID;
                pd.Save();
            }
        }

        private static PageDefinition GetNewPageDefinition()
        {
            PageDefinition pageDef = new PageDefinition();
            pageDef.Name = "TemplatePageGuid";
            pageDef.EditCaption = "Page Guid";
            pageDef.DisplayEditUI = false;
            pageDef.HelpText = "This is a hidden field that will be used to handle pagelinks for copying the new site.";
            pageDef.Type = new PageDefinitionType(6, Core.PropertyDataType.String, "String");
            pageDef.Tab = TabDefinition.Load("Advanced");
            pageDef.DefaultValueType = DefaultValueType.None;
            pageDef.Required = false;
            pageDef.Searchable = true;
            pageDef.LanguageSpecific = false;
            return pageDef;
        }