眾所周知，ADO.NET相對于ADO的最大優(yōu)勢在于對于數(shù)據(jù)的更新修改可以在與數(shù)據(jù)源完全斷開聯(lián)系的情況下進(jìn)行，然后再把數(shù)據(jù)更新情況傳回到

數(shù)據(jù)源。這樣大大減少了連接過多對于數(shù)據(jù)庫服務(wù)器資源的占用。下面是我在《ADO.NET實(shí)用指南》這本書上看到的一個(gè)例子，比較清楚的講解

了ADO.NET的使用方法。
Imports System.Data.SqlClient
Imports System.Data
Imports System.Data.Common

Public Class Form1
    Inherits System.Windows.Forms.Form

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim conn As New SqlConnection("data source=localhost;initial catalog=StudentCourse;" & _
        "User ID=;Password=;")
        Dim ds As New DataSet
        Try
            conn.Open()     '在形成SqlDataAdapter前打開conn
            Dim daAuthors As New SqlDataAdapter("Select * From SC", conn)
            Dim bldr As New SqlCommandBuilder(daAuthors)
            daAuthors.Fill(ds,"SC")
            conn.Close()    '在填充完ds后關(guān)閉連接，接著對ds進(jìn)行操作

            Dim tbl As New DataTable
            tbl = ds.Tables("SC")

            Dim rowVals(3) As Object
            rowVals(0) = "5"
            rowVals(1) = "00003"
            rowVals(2) = "0001"
            rowVals(3) = 99
            Dim insertedRow As DataRow
            insertedRow = tbl.Rows.Add(rowVals) '添加一行

            tbl.Rows(0).Delete()    '刪除一行

            tbl.Rows(1).BeginEdit()
            tbl.Rows(1)("score") = 89   '修改一行
            tbl.Rows(1).EndEdit()

            conn.Open()
            daAuthors.Update(ds.Tables("SC"))   '須將結(jié)果傳回?cái)?shù)據(jù)源時(shí)打開連接，update
            conn.Close()
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
    End Sub
End Class