How to Combine Data in 2 Table of different Worksheets?

How to Combine Data in 2 Table of different Worksheets?

Sample raw data in worksheet Sheet2:
Excel 2007

	A	B
1	Identity	Score
2	2	6
3	3	7
4	5	8
5	7	5
6	9	7
7	11	4
8	12	56
9	15	16
10	16	12
11	18	11
12	20	10
13	22	9
14	23	6
15	26	8
16	30	12
17	31	11
18	33	21
19	35	24
20	41	23
21	43	15
22	45	12
23

Sheet2

And, in worksheet Sheet1:
Excel 2007

	A	B	C
1	Identity	Name	Score
2	1	Mr. Name 1
3	2	Mr. Name 2	6
4	3	Mr. Name 3	7
5	4	Mr. Name 4
6	5	Mr. Name 5	8
7	6	Mr. Name 6
8	7	Mr. Name 7	5
9	8	Mr. Name 8
10	9	Mr. Name 9	7
11	10	Mr. Name 10
12	11	Mr. Name 11	4
13	12	Mr. Name 12	56
14	13	Mr. Name 13
15	14	Mr. Name 14
16	15	Mr. Name 15	16
17	16	Mr. Name 16	12
18	17	Mr. Name 17
19	18	Mr. Name 18	11
20	19	Mr. Name 19
21	20	Mr. Name 20	10

Sheet1

Worksheet Formulas Cell Formula C2 =IF(ISERROR(VLOOKUP(A2,Sheet2!A:B,2,)),"",VLOOKUP(A2,Sheet2!A:B,2,))