string strsql = "select * from " + table;
            SqlConnection cn = new SqlConnection(CommunionSearch.Common.CommunionSearchConfiguration.ConnectionString);
            //SqlCommand cmd = cn.CreateCommand();
            //cmd.CommandText = strsql;
            cn.Open();
            SqlDataAdapter da = new SqlDataAdapter();
            da.SelectCommand = new SqlCommand(strsql,cn);
            DataSet ds = new DataSet();
            SqlCommandBuilder sqlcmd = new SqlCommandBuilder(da);
            da.Fill(ds);
///dataset 更改
 ds.AcceptChanges();            
            da.Update(ds);
            cn.Close();
问题是ds 更改了 而数据库没更改啊 
什么 原因啊