C#

DataTable dtBit = new DataTable(); 
dtBit.TableName= "Macchine_Bit"; 

using (OleDbCommand cmd = new OleDbCommand("SELECT * FROM [Macchine_Bit] ORDER BY [FIELD_ID]", cnn))
{
	using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))
	{
		da.MissingSchemaAction = MissingSchemaAction.AddWithKey;
		da.Fill(dtBit = new DataTable());
	}
}

cnn.ConnectionString = String.Format(myConnectionString, mdbCopyName);
cnn.Open();

using (OleDbDataAdapter a = new OleDbDataAdapter("SELECT * FROM [Macchine_Bit]", cnn))
{
	OleDbCommandBuilder cb = new OleDbCommandBuilder(a);
	a.MissingSchemaAction = MissingSchemaAction.AddWithKey;
	a.InsertCommand = cb.GetInsertCommand();
	a.DeleteCommand = cb.GetDeleteCommand();
	a.UpdateCommand = cb.GetUpdateCommand();
	a.TableMappings.Add("Macchine_Bit", "Macchine_Bit");                

	DataTable dtBit2 = new DataTable();
	a.Fill(dtBit2);

	dtBit2.Merge(dtBit);
	a.Update(dtBit2);
}