能具体点不?

static private DataSet CreateCommandAndUpdate(
string connectionString,
string queryString)
{
DataSet dataSet = new DataSet();

using (OleDbConnection connection =
new OleDbConnection(connectionString))
{
connection.Open();
OleDbDataAdapter dataAdapter =
new OleDbDataAdapter();
dataAdapter.SelectCommand =
new OleDbCommand(queryString, connection);
OleDbCommandBuilder commandBuilder =
new OleDbCommandBuilder(dataAdapter);

dataAdapter.Fill(dataSet);

// 在这里写代码修改dataset里的数据.

dataAdapter.Update(dataSet);
}
return dataSet;
}