昨天折腾了一晚上，哪位高手帮我看看！急！

想用DataAdapter 把DataSet中的数据更新到数据库可是死活也更新新不进去，只在DataSet中更新了，数据库里一点也没变不知道为什么，以下是代码，望高手指点，感激不尽。string sql = "SELECT Title, Author, Type, Content, PDate FROM Article;";
   SqlConnection conn = new SqlConnection();
   conn.ConnectionString ="Data Source = (local); database = Finance; Integrated Security = SSPI;";
   SqlCommand myCom = conn.CreateCommand();
   myCom.CommandText = sql;
   SqlDataAdapter myAda = new SqlDataAdapter(myCom);
   myAda.InsertCommand = myCom;
   DataSet ds = new DataSet();
   conn.Open();
   myAda.Fill(ds,"test");
   DataRow newRow = ds.Tables["test"].NewRow();
   newRow["Title"] = "title2";
            newRow["Author"] = "mstc";
   newRow["Type"] = "type2";
   newRow["Content"] = "Content2";
   newRow["PDate"] = "Today";
   ds.Tables["test"].Rows.Add(newRow);
   try
   {
    myAda.Update(ds,"test");
   }
   catch(Exception ex)
   {
    this.Response.Write(ex.Message);
   }
   this.DataGrid1.DataSource = ds.Tables["test"].DefaultView;
   this.DataGrid1.DataBind(); 以上代码数据库连接绝对没有问题，运行中也没有抛出异常，DataSet中的增加了新行，可是教用UpDate方法后，数据库里并没有改变，不知道为什么