Ways of Reseting an Identity Column in the table.

Using Delete and then CHECKIDENT 
DELETE FROM DUMMY  
DBCC CHECKIDENT(DUMMY,RESEED, 0)  
SELECT * FROM DUMMY;

INSERT INTO DUMMY(NAME) VALUES('1');
INSERT INTO DUMMY(NAME) VALUES('2');
SELECT * FROM DUMMY;

Using Truncate  
Truncate Table DUMMY;
INSERT INTO DUMMY(NAME) VALUES('1');
INSERT INTO DUMMY(NAME) VALUES('2');
SELECT * FROM DUMMY;