public virtual int Compare(IServiceObject a, IServiceObject b)
{
// default implementation: string compare
string textA = (a == null) ? "" : a.GetText(ID);
string textB = (b == null) ? "" : b.GetText(ID);
if (textA == null)
textA = "";
if (textB == null)
textB = "";
return textA.CompareTo(textB);
}
