本人学习学做一个登陆窗体，运行时提示用户名或密码错，请大家帮我看下是哪个地方写错了，以下是原码：
Public Class Form3
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim cnStr As String, cmdtext As String
        cnStr = "provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & Application.StartupPath() & "\database.mdb"
        Dim cn As New OleDbConnection(cnStr)
        Dim cmd As OleDbCommand
        Dim dr As OleDbDataReader
        Dim dt As New DataTable("user")
        Try
            cn.Open()
            cmdtext = "select * from user where name='" & nametext.Text & "' and password='" & pwtext.Text & "'"
            cmd = New OleDbCommand(cmdtext, cn)
            dr = cmd.ExecuteReader
            If dr.HasRows Then
                MessageBox.Show("登陆成功", "系统登陆", MessageBoxButtons.OK, MessageBoxIcon.Information)
            Else
                dr.Close()
            End If

        Catch ex As Exception
            MessageBox.Show("用户名或密码错误", "系统登陆", MessageBoxButtons.OK, MessageBoxIcon.Information)
            nametext.Text = Nothing
            pwtext.Text = Nothing
            nametext.Focus()

        Finally
            cn.Close()
            cn = Nothing
        End Try
    End Sub

论坛太够意思了，发了这么久都没有人回应下，管理员去哪里了？该罚了！

回答：
一、查查百度就知道每天有多少人问登录的问题了，VS给了一个Debug的功能也不是摆设。
二、user这个名字好像不合法，我试个userInfo就没事了

请问楼上，你是用VS什么版本来试的，我用2005/2008都试过了结果还是一样，能不能把试好没有总是的原代码发给我，我调了很久都没有搞定，我的邮箱是wangkq-936@,谢谢你了，论坛就是用来学习交流的是吗！

我用的是2005日文版的
你这样定义
Dim cn As New OleDbConnection(cnStr)肯定是不行
应该
Dim cn As New OleDb.OleDbConnection(cnStr)
代码我给你发过去了

搞定了，谢谢你的帮助，

跟大家一起分享登陆问题的，VS2005下调试正常的代码：
Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click

        Dim cnStr As String, cmdtext As String
        cnStr = "provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & Application.StartupPath() & "\database.mdb"
        Dim cn As New OleDb.OleDbConnection(cnStr)
        Dim cmd As OleDb.OleDbCommand
        Dim dr As OleDb.OleDbDataReader
        Dim dt As New DataTable("userInfo")
        Try
            cn.Open()
            cmdtext = "select * from userInfo where name = '" & txtName.Text.ToString() & "' and password = '" & txtPassword.Text.ToString() & "'"
            cmd = New OleDb.OleDbCommand(cmdtext, cn)
            dr = cmd.ExecuteReader
            If dr.HasRows Then
                MessageBox.Show("登陆成功", "系统登陆", MessageBoxButtons.OK, MessageBoxIcon.Information)
            Else
                MessageBox.Show("用户名或密码错误", "系统登陆", MessageBoxButtons.OK, MessageBoxIcon.Information)
                txtName.Text = Nothing
                txtPassword.Text = Nothing
                txtName.Focus()
            End If
        Catch ex As Exception
             MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
        Finally
            cn.Close()
            cn = Nothing
        End Try