System.Data.OleDb查询，更新问题

Question

string DBPath = System.IO.Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "dbvoter.mdb");
            string connstr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + DBPath + "";                 
            OleDbConnection conn = new OleDbConnection();           
            conn.ConnectionString = connstr;
            conn.Open();
            sda = new OleDbDataAdapter("select * from [voter]", conn);
            OleDbCommandBuilder commbuider = new OleDbCommandBuilder(sda);
            sda.UpdateCommand = commbuider.GetUpdateCommand();
            dt = new DataTable();
            sda.AcceptChangesDuringUpdate = true;
            sda.Fill(dt);
读取显示没问题，在用sda.Update(dt);更新时提示更新语句有语法错误

Answer 1

conn.Open();
            sda = new OleDbDataAdapter("select * from [voter]", conn);
            OleDbCommandBuilder commbuider = new OleDbCommandBuilder(sda);
            dt = new DataTable();
            sda.Fill(dt);
            //修改dt
            sda.Update(dt);