How to use multiple statements inside the "THEN" block of CASE statement?

Question

Below is the code:
SET @strTempString = case @strKeyMode
WHEN 'AUTO/CYCLE'
THEN  @strRefID + '|' + @strRetID
WHEN 'CYCLE'
THEN  @strRefID + '|' + @strRetID
WHEN 'COMMERCIAL'
THEN  @strRefID + '|' + @strRetID
WHEN 'ISNAP'
THEN  set @strFName = ltrim(rtrim((Left(dbo.CleanTheStringAdv(@strFName + '  ', 2) + '  ', 2))))
'' + @strRefID + '|' + @strLName + '|' + @strFName + '|' + @strZIPorPolType
WHEN 'ASNAP'
THEN  @strRefID + '|' + @strRetID
WHEN 'MOAT'
THEN  @strRefID + '|' + @strRetID
else '0'
end 
The first 3 conditions are understandable. How to use multiple statements in 4th case?
Here I first want to set the value as:
set @strFName = ltrim(rtrim((Left(dbo.CleanTheStringAdv(@strFName + '  ', 2) + '  ', 2))))
and then return the string '' + @strRefID + '|' + @strLName + '|' + @strFName + '|' + @strZIPorPolType to @strTempString. 
Please help me remove the syntax errors.
Thanks in advance.

Answer 1

Try below SQL
DECLARE @strKeyMode varchar(20) = 'ISNAP'
DECLARE @SQL VARCHAR(MAX)
DECLARE @strRefID int=1
DECLARE @strRetID INT=2
--FIRST WAY
IF @strKeyMode ='AUTO/CYCLE'
SELECT CAST(@strRefID as varchar(10))
ELSE IF @strKeyMode ='CYCLE'
SELECT @sql = CAST(@strRefID as varchar(10)) + '|' + CAST(@strRetID as varchar(10))
ELSE IF @strKeyMode='ISNAP'
SELECT @sql = CAST(@strRefID as varchar(10)) + '|' + CAST(@strRetID as varchar(10))+'test'+'abc'
ELSE
SELECT @SQL='ABC'
print @sql
----SECOND WAY
SELECT @SQL = CASE @strKeyMode
WHEN 'AUTO/CYCLE' THEN CAST(@strRefID as varchar(10))
WHEN 'CYCLE' THEN CAST(@strRefID as varchar(10)) + '|' + CAST(@strRetID as varchar(10))
WHEN 'ISNAP' THEN CAST(@strRefID as varchar(10)) + '|' + CAST(@strRetID as varchar(10))+'test'+'abc'
ELSE 'No Record'
END
PRINT (@SQL)
--Prashanth