How can I drop my temp table if it exits? - sql-server-2008-r2

Question

I have to have a temp table to store some memberIds. I need to drop the table every time because I want its data always be fresh and updated. But I need it to be dropped before it being re-created every time. But it seems somehow SQL-server doesn't execute my whole script.
IF OBJECT_ID('tempdb.dbo.#available_memberIds', 'U') IS NOT NULL
BEGIN
DROP TABLE #available_memberIds;
CREATE TABLE #available_memberIds (
memberId Int,);
Insert into #available_memberIds SELECT memberId
FROM tbl_attendancemembers
WHERE memberId NOT IN
(SELECT memberId
FROM tbl_attendanceSheet)
UNION
SELECT memberId
FROM tbl_attendancemembers
WHERE memberId IN
( SELECT memberId
FROM tbl_attendanceSheet
GROUP BY memberId, date
HAVING COUNT(*) <= 1)
END
When I Highlight the whole code and execute it, it says executing was successful. But when I select * from #available_memberIds it doesn't show any memberId which means it doesn't insert anything to the table. Although when I highlight only the Insert Into part individually and select * from #available_memberIds it shows the memberIds.
Don't I have to write something for the IF conditions else part? I copied everything except the drop part for the else part but when I execute whole code(containing the else part) it always says
There is already an object named '#available_memberIds' in the
database.
Which is weird because when I highlight only the drop part and execute it, it says >Can not drop the table
'#available_memberIds', because it does not exist or you do not have
permission.
And when I select * from #available_memberIds it says :
Invalid object name '#available_memberIds'.
IF OBJECT_ID('tempdb.dbo.#available_memberIds', 'U') IS NOT NULL
BEGIN
DROP TABLE #available_memberIds;
CREATE TABLE #available_memberIds (
memberId Int,);
BEGIN
Insert into #available_memberIds SELECT memberId
FROM tbl_attendancemembers
WHERE memberId NOT IN
(SELECT memberId
FROM tbl_attendanceSheet)
UNION
SELECT memberId
FROM tbl_attendancemembers
WHERE memberId IN
( SELECT memberId
FROM tbl_attendanceSheet
GROUP BY memberId, date
HAVING COUNT(*) <= 1)-- and date=#inputdate)
END
END
ELSE
BEGIN
CREATE TABLE #available_memberIds (
memberId Int,);
BEGIN
Insert into #available_memberIds SELECT memberId
FROM tbl_attendancemembers
WHERE memberId NOT IN
(SELECT memberId
FROM tbl_attendanceSheet)
UNION
SELECT memberId
FROM tbl_attendancemembers
WHERE memberId IN
( SELECT memberId
FROM tbl_attendanceSheet
GROUP BY memberId, date
HAVING COUNT(*) <= 1)-- and date=#inputdate)
END
END
I'm writing SQL codes in the visual studio database manager

Answer 1

You could use something like this. Then put your code After it. Make sure there are two dots between tempdb and your temp table. Then you don't need multiple statements, it will just delete it and re-create it every time.
IF OBJECT_ID('tempdb..#available_memberIds') IS NOT NULL
DROP TABLE #available_memberIds;
...
SELECT memberId
INTO #available_memberIds
FROM tbl_attendancemembers
WHERE memberId NOT IN
(SELECT memberId
FROM tbl_attendanceSheet)
UNION
SELECT memberId
FROM tbl_attendancemembers
WHERE memberId IN
( SELECT memberId
FROM tbl_attendanceSheet
GROUP BY memberId, date
HAVING COUNT(*) <= 1)-- and date=#inputdate)
END