need help on Expression syntax

Hi all,I am trying to create the Expression equivalent of the following query:SELECT count(TasksName) FROM [db].[dbo].[testdetails]where TopLevelProjectName = '40 Project Folder'and TasksName = 'Project Info'I basically need a working version of this incorrect syntax:=CountDistinct(IIF(Fields!TopLevelProjectName.Value = "40 Project Folder" AND Fields!TasksName.Value = "Project Info"))Thanks in advance,Sharon