ADO.NET Question:

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a. Update a dataset;
Dataset ds = new dataset();
SqlDataAdapter adp = new SqlDataAdapter(Query,connection);
Adp.fill(ds);
Again you can add/update Dataset as below
SqlDataAdapter adp1 = new SqlDataAdapter(Query1,connection);
Adp1.fill(ds);

b. Update database through dataset.
SqlCommandBuilder mySqlCommandBuilder = new SqlCommandBuilder(mySqlDataAdapter);
Foreach(datarow dr in ds.table[0].rows)
{
Dr[“column Name”] = “value”;
mySqlDataAdapter.Update(ds);
}