System.Xml.XmlWriter.WriteQualifiedName C# (CSharp) Method

        public virtual void WriteQualifiedName(string localName, string ns) {
            if (ns != null && ns.Length > 0) {
                string prefix = LookupPrefix(ns);
                if (prefix == null) {
                    throw new ArgumentException(Res.GetString(Res.Xml_UndefNamespace, ns));
                }
                WriteString(prefix);
                WriteString(":");
            }
            WriteString(localName);
        }

 public override void WriteQualifiedName(string localName, string ns)
 {
     writer.WriteQualifiedName(localName, ns);
 }