NuGet.UserSettings.DeleteValue C# (CSharp) Method

        public void DeleteValue(string section, string key)
        {
            if (String.IsNullOrEmpty(section)) {
                throw new ArgumentException("Argument cannot be null or empty.", "section");
            }
            if (String.IsNullOrEmpty(key)) {
                throw new ArgumentException("Argument cannot be null or empty.", "key");
            }

            var sectionElement = _config.Root.Element(section);
            if (sectionElement == null) {
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, NuGetResources.UserSettings_SectionDoesNotExist, section));
            }

            XElement elementToDelete = null;
            foreach (var e in sectionElement.Elements("add")) {
                if (e.GetOptionalAttributeValue("key") == key) {
                    elementToDelete = e;
                    break;
                }
            }
            if (elementToDelete == null) {
                throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, NuGetResources.UserSettings_SectionDoesNotExist, section));
            }
            elementToDelete.Remove();
            Save(_config);
        }