asp.net和sql server 2008的隔离级别策略

Question

什么应该是理想的asp.net和sql server 2008的隔离级别策略。我们使用read-commited但它仍然挂起，见下文。

• 表名 - Customers
• 隔离级别 - Read Committed

交易1：

set transaction isolation level read committed
Begin Tran

UPDATE Customers
SET ordercount = 50 
WHERE id = 2

WAITFOR DELAY '000:00:20'
rollback tran

交易2：

set transaction isolation level read committed
Begin Tran

Select * From Customers 

Trans commited

交易2挂起20秒!!如何处理这种情况？

此致

CHANDAN