論壇中VB版里經(jīng)常見(jiàn)到一些朋友問(wèn)到關(guān)于登陸的問(wèn)題，這篇文章專門(mén)為初學(xué)的朋友提供一些幫助，當(dāng)然希望有更好辦法的高手給予指點(diǎn)。   首先 文件→新建→項(xiàng)目 選擇windows應(yīng)用程序 并在窗體上添加2個(gè)label控件、2個(gè)textbox控件、2 個(gè)buton控件如下圖（1-1）：     
  界面設(shè)計(jì)好后在button的click事件中寫(xiě)入代碼如下：


（在程序頂部引用Imports System.Data.OleDb）    Private Sub BOk_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BOk.Click
        '定義
        Dim olecn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Data.mdb")
        Dim olecm As New OleDbCommand("select * from Login", olecn)
        Dim olead As New OleDbDataAdapter
        Dim olerd As OleDbDataReader
        Dim pd As Boolean = False '定義boolean為后面錯(cuò)誤處理使用
        Dim i As Integer
        olecm = New OleDbCommand("select * from Login", olecn)
        '與數(shù)據(jù)庫(kù)建立連接
        olecn.Open()
        olerd = olecm.ExecuteReader
        '循環(huán)判斷與數(shù)據(jù)庫(kù)中數(shù)據(jù)是否相同
        Do While olerd.Read()
            For i = 0 To olerd.FieldCount - 1
                If Trim(TUser.Text) = (olerd.Item("帳號(hào)")) And Trim(TPassword.Text) = (olerd.Item("密碼")) Then
                    MsgBox("成功登陸")
                    pd = True
                    Exit Sub
                End If
            Next
        Loop
        TUser.Text = ""
        TPassword.Text = ""
        TUser.Focus()
        olerd.Close()
        olecn.Close()
    End Sub           整個(gè)過(guò)程就做完了簡(jiǎn)單吧。         QQ：174453914