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

		internal void WriteQualifiedNameInternal (string localName, string ns)
		{
			if (localName == null || localName == String.Empty)
				throw new ArgumentException ();
			if (ns == null)
				ns = String.Empty;

#if NET_2_0
			switch (Settings.ConformanceLevel) {
			case ConformanceLevel.Document:
			case ConformanceLevel.Fragment:
				XmlConvert.VerifyNCName (localName);
				break;
			}
#else
			XmlConvert.VerifyNCName (localName);
#endif

			string prefix = ns.Length > 0 ? LookupPrefix (ns) : String.Empty;
			if (prefix == null)
				throw new ArgumentException (String.Format ("Namespace '{0}' is not declared.", ns));

			if (prefix != String.Empty) {
				WriteString (prefix);
				WriteString (":");
				WriteString (localName);
			}
			else
				WriteString (localName);
		}