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Dll reference in BIN directory - not sure why it works

I have a DAL, BAL and the UI.
In my DAL and BAL, i have a reference to IBM.Data.DB2.iSeries dll.
I also use SQLClient.
I use this code for my DAL (changed it to VB.Net): http://aspalliance.com/837_Implementing_a_Data_Access_Layer_in_C
Users can choose either between IBM connection or SQL connection.
I copied the entire code to another server.
I brought up the site and chose "SQL" connection but got an error about the IBM dll.
*** I copied the IBM.Data.Db2.iSeries.dll to the BIN directory of the UI folder and it works..., i didnt get the IBM error... ***

Why is that? When I chose SQL, why was it looking for the IBM dll?? So now when we give the application to a client who has SQL2000, we have to give them the IBM dll as well??
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1 Solution
You dont have to copy manually IBM.Dll to Bin folder. If you are refering to project by 'Add Reference' option it will copy automatically to bin folder. There by you can avoid any errors while installation. so better to refere IBM.dll by using 'Add Reference'.

I hope this makes clear.
It will create automatically only if you could build sucessfully. Forgot to mention that.
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