the start of every log is the time stamp enclosed in "[" and "]"

i wanted to read the last log based on the sample below where it should be:

[1/26/12 1:06:11:621 CST] 0000003b ExceptionUtil E CNTR0020E: EJB threw an unexpected (non-declared) exception during invocation of method "getObjects" on bean "BeanId

this is the sample code i use to read the log file:

Code:
TextReader tr = new StreamReader("c:\log.txt");
if i use: string endText = tr.ReadToEnd(), this will give me the last line which is:

at com.filenet.engine.ejb.EngineCoreBean.getUserName(EngineCoreBean.java:744)


how can i get to read the start of this last log from bottom up?

thanks in advance.


Code:
[1/25/12 1:06:11:652 CST] 0000003b LocalTranCoor E   WLTC0017E: Resources rolled back due to setRollbackOnly() being called.
[1/25/12 1:06:33:027 CST] 00000037 WSRdbManagedC W   DSRA9510W: Custom property preTestSQLString should not be empty if the pre-test connection option is selected.
[1/25/12 1:14:41:159 CST] 00000025 LdapRegistryI A   SECJ0419I: The user registry is currently connected to the LDAP server ldap://SANETDCPRD01:389.
[1/26/12 1:06:11:621 CST] 0000003b LocalTranCoor E   WLTC0017E: Resources rolled back due to setRollbackOnly() being called.
[1/26/12 1:06:11:621 CST] 0000003b ExceptionUtil E   CNTR0020E: EJB threw an unexpected (non-declared) exception during invocation of method "getObjects" on bean "BeanId(FileNetEngine#Engine-ejb-ws.jar#Engine, null)". Exception data: com.filenet.api.exception.EngineRuntimeException: SECURITY_LDAP_PROVIDER_FAILED: LDAP Provider Access failed for principal 'P8PEAdmin_DEV'. Root cause: SANETDCPRD01:3268; socket closed
                at com.filenet.engine.security.SecurityProvider.getUser(SecurityProvider.java:681)
                at com.filenet.engine.jca.impl.RequestBrokerImpl.getUserName(RequestBrokerImpl.java:1291)
                at com.filenet.engine.ejb.EngineCoreBean._getUserName(EngineCoreBean.java:762)
                at com.filenet.engine.ejb.EngineCoreBean.getUserName(EngineCoreBean.java:744)