What is the use of the CommandBuilder class ?

public static DataSet SelectSqlRows(string connectionString,

    string queryString, string tableName)

{

    using (SqlConnection connection = new SqlConnection(connectionString))

    {

        SqlDataAdapter adapter = new SqlDataAdapter();

        adapter.SelectCommand = new SqlCommand(queryString, connection);

        SqlCommandBuilder builder = new SqlCommandBuilder(adapter);



        connection.Open();



        DataSet dataSet = new DataSet();

        adapter.Fill(dataSet, tableName);



        //code to modify data in DataSet here



        builder.GetUpdateCommand();



        //Without the SqlCommandBuilder this line would fail

        adapter.Update(dataSet, tableName);



        return dataSet;

    }

}