谁能帮我看看这是什么问题？ - 编程论坛

小弟初学，现写了一个程序如下：
<%@ Page Language="VB" %>

<script language="VB" runat="server">

    Sub tbMessage_Change(Sender As Object, E As EventArgs)

    lblMessage.text = "Hello" + tbMessage.Text

    End Sub

</script>

<html>
<title>List0104</title>
<body>
<font size="5">Sam's Teach YourSelf in 21 Days: Day 1</font><hr><p>

<%Response.Write("Our First Page<p>")%>
    <form runat="server">
    Please enter your name:
    <asp:textbox id="tbMessage"
    OnTextChanged="tbMessage_Change"
    ranat=server/>
    <asp:button id="btSubmit" Text="Submit"
    ranat=server/>
    <asp:label id="lblMessage" font-size="20pt"
    ranat=server/>
    </form>
</body>
</html>
总是提示：“Name 'lblMessage' is not declared”，我觉得这个变量已经声明了呀！
请各位大大指点一下！