How to generate a range of numbers between two numbers?

Question

I have two numbers as input from the user, like for example 1000 and 1050.

How do I generate the numbers between these two numbers, using

Answer 1

;WITH u AS (
    SELECT Unit FROM (VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9)) v(Unit)
),
d AS (
    SELECT 
        (Thousands+Hundreds+Tens+Units) V
    FROM 
           (SELECT Thousands = Unit * 1000 FROM u) Thousands 
           ,(SELECT Hundreds = Unit * 100 FROM u) Hundreds 
           ,(SELECT Tens = Unit * 10 FROM u) Tens 
           ,(SELECT Units = Unit FROM u) Units
    WHERE
           (Thousands+Hundreds+Tens+Units) <= 10000
)

SELECT * FROM d ORDER BY v