Table locking while insert statement

I have two tables for insertion in one transaction scope. Table one have 10 rows. After first table insert statement (not yet committed) if I run select on first table from other session, it holds table until my insert is committed or rolled back and from (SSMS), it display 10 rows and then wait for transaction scope till finished. My question is do I need to use no lock hint in this situation. Or there is something wrong with isolation level. One saying that in this situation table should not hols select while insert is in transaction scope.Shamshad Ali