How to insert/update in Table - in another SQL Database

Hi

We have employee expenses data entry  application in our company. Developed in Dot net with SQL server.

Every employee will enter the entry once it is saved , the  same data we should write into  another  SQL database table.

And some instance , based on user choice we need to allow user to modify the data - I have to modify my table  - after saving in my table i have do the same update on the other SQL database table.

Can you please suggest  what is best way to  -access  other SQL database.

One such i got is : DTS package- to insert to new record. Schedule it for every half hour..

Thanks