say suppose i want to insert or update many records into file table. how this kind of job can be done by ado.net easily writing minimum code.

Create you queries using the DataAdapter configuration wizard by dragging an adapter onto your web form in VS.NET.
Four command objects will be created. Call the update method of the dataadapter on the changes stored in your dataset and the update will go through. It is actually snappy using the wizard

You can find some solutions Here

And @ this website
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vbcon/html/vboridataupdatesinvisualstudionet.asp

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BrainBench ADO.NET and ASP.NET Certified Developer