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

        public override void WriteQualifiedName(string localName, string namespaceUri)
        {
            if (IsClosed)
                ThrowClosed();
            if (localName == null)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException(nameof(localName)));
            if (localName.Length == 0)
                throw System.Runtime.Serialization.DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.Format(SR.InvalidLocalNameEmpty), nameof(localName)));
            if (namespaceUri == null)
                namespaceUri = string.Empty;
            string prefix = GetQualifiedNamePrefix(namespaceUri, null);
            if (prefix.Length != 0)
            {
                WriteString(prefix);
                WriteString(":");
            }
            WriteString(localName);
        }