what are differences between ADODB and ADODC..??

That's simple; ADODB is the type library, and ADODC is a control (which is placed on a form). ADODC just makes use of ADODB. With ADODB allows you to access a database by code, without the need of an extra control.

Tom Cannaerts
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Programming today is a race between software engineers striving to build bigger and better idot-proof programs, and the universe trying to produce bigger and better idiots. So far, the universe is winning -- Rich Cook