Display Custom Metadata in the Advanced Search Web Part within SharePoint

                        string advancedUrl = newSearchWebSearch.Url + "/Pages/advanced.aspx";

                        SPFile advanceFile = newSearchWebSearch.GetFile(advancedUrl);

                        if (advanceFile.Exists)

                        {

                            advanceFile.CheckOut();

                            //Get Result search page

                            SPListItem wikiItem = advanceFile.Item;

                            string managePropertyname = strSubjectAreaName + getPropertyType(newSearchWeb, strSubjectAreaName), managePropertytype = getPropertySearchType(newSearchWeb, strSubjectAreaName), managePropertyDisplayName= strSubjectAreaName;

                            SPLimitedWebPartManager advsearchwebPartManager = newSearchWebSearch.GetLimitedWebPartManager(advancedUrl, PersonalizationScope.Shared);

                            foreach (var wsp in advsearchwebPartManager.WebParts)

                            {

                                if (wsp is AdvancedSearchBox)

                                {

                                    var wpAdavance = wsp as AdvancedSearchBox;

                                    string SearchQuery = wpAdavance.Properties.ToString();

                                    XmlDocument xmlDocs = new XmlDocument();

                                    xmlDocs.LoadXml(SearchQuery);

                                    XmlNodeList category1 = xmlDocs.SelectNodes("/root/r");

                                    XmlNodeList category = xmlDocs.SelectNodes("/root/PropertyDefs");

                                    XmlNodeList resulttype = xmlDocs.SelectNodes("/root/ResultTypes/ResultType");

                                    var newProperty = xmlDocs.CreateNode(XmlNodeType.Element, "PropertyDef", "");

                                    var property_attribute4 = xmlDocs.CreateAttribute("Name");

                                    property_attribute4.Value = managePropertyname;

                                    var property_attribute1 = xmlDocs.CreateAttribute("DataType");

                                    property_attribute1.Value = managePropertytype;

                                    var property_attribute2 = xmlDocs.CreateAttribute("DisplayName");

                                    property_attribute2.Value = managePropertyDisplayName;

                                    newProperty.Attributes.Append(property_attribute4);

                                    newProperty.Attributes.Append(property_attribute1);

                                    newProperty.Attributes.Append(property_attribute2);

                                    foreach (XmlNode node in category)

                                    {

                                        if (node.Name == "PropertyDefs")

                                        {

                                            category[0].AppendChild(newProperty);

                                        }

                                    }

                                    for (int j = 0; j < resulttype.Count; j++)

                                    {

                                        var Result_newInnerNode = xmlDocs.CreateNode(XmlNodeType.Element, "PropertyRef", "");

                                        var result_attribute = xmlDocs.CreateAttribute("Name");

                                        result_attribute.Value = managePropertyname;

                                        Result_newInnerNode.Attributes.Append(result_attribute);

                                        resulttype[j].AppendChild(Result_newInnerNode);

                                    }

                                    wpAdavance.Properties = xmlDocs.InnerXml;

                                    advsearchwebPartManager.SaveChanges(wpAdavance);

                                }

                            }

                            newSearchWebSearch.AllowUnsafeUpdates = true;

                            advanceFile.CheckIn("Publish", SPCheckinType.MajorCheckIn);

                            advanceFile.Publish("Publish");

                            _sitePage.Update();

                            newSearchWebSearch.Update();

                            newSearchWebSearch.AllowUnsafeUpdates = false;

                        }

                        //Based on Subject Seperate search Page