Raise an error manually in T-SQL to jump to BEGIN CATCH block

Is it possible to raise an error in a stored procedure manually to stop execution and jump to BEGIN CATCH block? Some analog of throw new Exception() in C#.

Here is my stored procedure's body:

BEGIN TRY
BEGIN TRAN

-- do something

IF @foobar IS NULL
    -- here i want to raise an error to rollback transaction    

-- do something next

COMMIT TRAN
END TRY
BEGIN CATCH
    IF @@trancount > 0
        ROLLBACK TRAN
    END CATCH

I know one way: SELECT 1/0 But it's awful!!