public override String ToString()
        {
            StringBuilder sb = new StringBuilder();

            sb.Append("(")
            .Append((Left != null) ? Left.ToString() : "null")
            .Append(" ")
            .Append(Conjunction.ToString())
            .Append(" ")
            .Append((Right != null) ? Right.ToString() : "null")
            .Append(")");
            return(sb.ToString());
        }
 /// <summary>
 /// Returns a string representation of the FileSelector object.
 /// </summary>
 /// <returns>The string representation of the boolean logic statement of the file
 /// selection criteria for this instance. </returns>
 public override String ToString()
 {
     return("FileSelector(" + _Criterion.ToString() + ")");
 }