Parsing a Blank in SSRS Expression

     @P1 NVARCHAR(15) = ''
   , @P2 NVARCHAR(10) = Null
   , @P3 CHAR(1)

Now I want to dynamically set the report name base on parameters selected.

• If @P3 = A and @P1 <> "" then ReportName1
• If @P3 = B and @P1 = "" & @P2 <> Null then ReportName
• if @P3 = C and @P2 = Null and @P1 = "" then ReportName

I got number three to work but not list one and two. How do I make this work?

Thank you

Zionlite