在datagridview中修改数据，为什么数据库没有更新

Question

string connstr = "Provider=Microsoft.Jet.OleDb.4.0;";
connstr += @"Data Source=D:\Merger201503016caohuan\GEARCNC.mdb";//创建连接对象

        OleDbConnection tempconn = new OleDbConnection(connstr);
        tempconn.Open();



        OleDbDataAdapter DressingWheelDA = new OleDbDataAdapter("select * from DressingWheel order by 修整轮名称", tempconn);
        DataSet ds = new DataSet();
        DressingWheelDA.Fill(ds, "DressingWheel");



        OleDbCommandBuilder builder = new OleDbCommandBuilder(DressingWheelDA);

        if (ds.HasChanges())
        {
            try
            {

                DressingWheelDA.Update(ds, "DressingWheel");
            }
            catch (Exception ex)
            {
                MessageBox.Show("修整轮名称重复", "信息提示");

            }
        }

Answer 1

catch中加上
MessageBox.Show(ex.Message)看下具体错误信息
是不是违法了约束，或者主键重复之类的错误