System.Xml.XmlBaseWriter.NamespaceManager.AddNamespaceIfNotDeclared C# (CSharp) Method

            public void AddNamespaceIfNotDeclared(string prefix, string uri, XmlDictionaryString uriDictionaryString)
            {
                if (LookupNamespace(prefix) != uri)
                {
                    AddNamespace(prefix, uri, uriDictionaryString);
                }
            }