Can DataAdapter object accept DataTable as parameter in Fill method?

Answer:

Yes,

DataAdapter object can accept either DataTable or DataSet as parameter to fill data from database.

eg.

SqlDataAdapter dAd = new SqlDataAdapter();

DataTable dTable = new DataTable();

DataSet dSet = new DataSet();

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dAd.Fill(dTable); // will also work

dAd.Fill(dSet); // will also work

We should only use DataSet as parameter when we are expecting more than one result set is being returned from database.