I have two columns in my IIF statements called DEPT_CODE and UNIQUE_CODE what i'm trying to do is return "blank" if the UNIQUE_CODE equals to 2343 else return the DEPT_CODE value.
IIF UNIQUE_CODE = "2343" Then return " " ELSE return DEPT_CODE value
You've basically written it..
=IIF(Fields!UNIQUE_CODE.Value = "2343", "", Fields!DEPT_CODE.Value)
Note that this returns an empty string. In your pseudo code you had a single space. Change as required.
The IIF statement works as follows.
IIF( <boolean expression to evaluate> , <return this if true>, <return this if false> )