NOTE: The variable PropExists as bool has been already created The Property of interest is BTS.RetryCount The Message is Message_In The list from Using Operators in Expressions (http://msdn2.microsoft.com... has the typical list of stuff that you expect in C#, multiplication, bit operations (shift left and right) and Boolean operators, but a couple of extremely useful constructs are available that are unique to BizTalk. The most important of these (in my humble opinion) ......