text: public override ValueEval Evaluate(int srcRowIndex, int srcColumnIndex, ValueEval arg0, ValueEval arg1){ValueEval ve0;ValueEval ve1;try{ve0 = OperandResolver.GetSingleValue(arg0, srcRowIndex, srcColumnIndex);ve1 = OperandResolver.GetSingleValue(arg1, srcRowIndex, srcColumnIndex);}catch (EvaluationException e){return e.GetErrorEval();}StringBuilder sb = new StringBuilder();sb.Append(GetText(ve0));sb.Append(GetText(ve1));return new StringEval(sb.ToString());}