Yup, here is the relevant portion.

/// <summary>
/// Returns a logical value indicating if the string value is empty.
/// If allowEmptyValue = true, empty means an empty string
/// If allowEmptyValue = false, empty means an empty or null string 
/// </summary>
/// <param name="value">String value</param>
/// <param name="allowEmptyValue">Specifies if an empty string is allowed</param>
/// <returns>True if empty, otherwise false</returns>
public static bool IsEmpty(string value, bool allowEmptyValue)
{
     if (allowEmptyValue)
     {
          return value == null;
     }
     else
     {
          return String.IsNullOrEmpty(value);
     }
}

>
>>Hey thanks for the response Bob. I have reviewed the help information. What I don't get is what is the meaning of "Empty"? I know what NULL is...
>>
>>A users interpretation of Empty is if they do not see any characters, then it's Empty. I tend to agree. It appears that the MM.NET framework BLG does not interprete it this way when building rules. I just hate to have to over-ride the generated code worrying that a rule for an Empty string will not indicate the string is Empty (no visible characters).