System.Xml.Xsl.XsltOld.Processor.EvaluateString C# (CSharp) Method

        internal string EvaluateString(ActionFrame context, int key) {
            object objValue = Evaluate(context, key);
            string value = null;
            if (objValue != null)
                value = XmlConvert.ToXPathString(objValue);
            if (value == null)
                value = string.Empty;
            return value;
        }

 public override string Evaluate(Processor processor, ActionFrame frame) {
     return processor.EvaluateString(frame, this.key);
 }