我在解决方案资源管理器中按分类建了学生登陆窗体文件夹、学生注册窗体文件夹。目的就是为了清楚。可是为什么必须在每个文件加中都得建立同样的数据库，要不然找不到路径。我用的代码是：
  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim ConnString As String
        Dim strSql As String
        Dim Conn As New OleDbConnection
        ConnString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="
        ConnString += Server.MapPath("22.mdb")
        Conn.ConnectionString = ConnString
        Conn.Open()
        Dim cmd As New OleDbCommand
        Dim lngCount As Long
        strSql = " select * from mima where 学号='" & txtUserName.Text & "'And 密码='" & Password.Text & "'"
        cmd.Connection = Conn
        cmd.CommandText = strSql
        lngCount = cmd.ExecuteScalar()
        If lngCount = 0 Then
            Response.Write("<script languaage='javascript'>alert('对不起！用户名和密码不符，请重新输入！')</script>")
            txtUserName.Text = ""
            Password.Text = ""
        Else
            Response.Redirect("http://www.163.com")
        End If
        cmd.Dispose()
        Conn.Close()