How to use the same temporary table twice in a stored procedure

Let's make an example
you  want to use a temporary table in the same Stored Procedure based on different Condition, as below:

IF(Condition)
BEGIN
select something  & Insert into #TempTable
where condition
END
ELSE
BEGIN
select something  & Insert into #TempTable
where condition
END

If you try to compile this kind of code, it will return an error like 'There is already an object named #myTempTable in the database'. SQL doesn't allow you to use the ‘into #TempTable’ twice in the same Stored Procedure.

So the simplest way is, create the temporary table first, then make the if-else condition

DECLARE @VAL INT=1;

--Create temp Table

select * into #Temp  from dbo.tblCountries where 0=1

 --insert records to temp table

IF(@VAL=1)

      BEGIN

            INSERT INTO #Temp

            select *

            FROM dbo.tblCountries

            --Where

      END

ELSE

      BEGIN

            INSERT INTO #Temp

            select *

            FROM dbo.tblCountries

            --Where

      END

DROP TABLE #Temp