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hi guys,

if we want to get the data from multiples dataproviders(ie., from sqlserver,oracle,sybase,msoracle,msaccess and so.......)
then how can i made a connection to the databases using in

You need to read about Data Provider Model

It is based on Provider Design Pattern and can be used for such scenarios. There are lots of material on internet.
For start, read here:The Provider Model[^]
Its better to make an Interface, which has the declaration of all the basic method that one needs to use in application.Now make a class for evry dataprovider with implementing the interface. Now at runtime you need to decide which class you want to instantiate based on the dataprovider and use it.
You can put all the connection strings in DB.
You have a switch/case statement that uses a different connection string for each database type. Use Connection Strings from this website: clickety[^]

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