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Possible Duplicate:
Datatable vs Dataset
Can someone please explain the difference to me or point me in the right direction? When should you use one over the other? What are differences?
a datatable represents tabulated data just like a database table. a dataset is synonymous with a database; it contains datatables, relationships etc. a datareader is a forward only row by row reader that requires an open connection. you can fill a datatable with a dataadapter. for reading look up ADO.NET.