If you need to reseed identity column, use DBCC CHECKIDENT command.
DBCC CHECKIDENT (table_name, RESEED, starting_value)
Thing to note here is that starting value should be one less than the next value you want to see in your identity column. So if you are reseeding the table and want to see 1 in the identity column when next record is inserted, put 0 as starting value.
You can read more about DBCC CHECKIDENT on MSDN.