一个简单的用户登陆程序

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以下程序是用来验证用户登录的共有两个按钮，一个是用来提交的，一个是用来重填的，页面部分就很简单了，两个文本框，两个按钮，这里页面的代码就不写了：）

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        If TextBox3.Text = "" Or TextBox4.Text = "" Then
            Label35.Text = "请确认您的输入！"
            Return
        End If
        Dim sql As String = "select * from pwd where stu_id=@stu_id and pwd=@pwd"
        Dim comm As SqlCommand = New SqlCommand(sql, conn)
        comm.Parameters.Add(New SqlParameter("@stu_id", SqlDbType.Int, 4))
       comm.Parameters("@stu_id").Value = TextBox3.Text
        comm.Parameters.Add(New SqlParameter("@pwd", SqlDbType.Char, 16))
        comm.Parameters("@pwd").Value = TextBox4.Text
        Dim dr As SqlDataReader
        conn.Open()
        dr = comm.ExecuteReader
        If dr.Read Then
            Session("stu_id") = TextBox3.Text
            dr.Close()
            comm.Cancel()
            Dim sql_3 As String = "update stu_base set point=point+1 where stu_id=@stu_id"
            comm = New SqlCommand(sql_3, conn)
            comm.Parameters.Add(New SqlParameter("@stu_id", SqlDbType.Int, 4))
            comm.Parameters("@stu_id").Value = Session("stu_id")
           comm.ExecuteNonQuery()
            comm.Cancel()
            Response.Redirect("detail.aspx?stu_id='" & Session("stu_id") & "'")
        Else
            Label35.Text = "您还没有注册或账号密码错误"
        End If
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        TextBox1.Text = ""
        TextBox2.Text = ""
    End Sub