differentiating odd and even numbers in a table

I need to be able to tell if a number is even or odd
I tried this but it is giving errors
I am trying to create a UDF

      DECLARE @rate int
      if @proj_no = ((@proj_no % 2)=0) set @rate = 2
      else set @rate = 1
      RETURN @rate

The errors are
Msg 102, Level 15, State 1, Procedure nRate, Line 6
Incorrect syntax near '='.
Msg 156, Level 15, State 1, Procedure nRate, Line 7
Incorrect syntax near the keyword 'else'.
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      DECLARE @rate int
      set @rate = case when (@proj_no % 2)=0 then 2 else 1 end
      RETURN @rate

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TagomAuthor Commented:
I was almost there this worked great
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Microsoft SQL Server 2008

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