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<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="MyPage" %>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Label ID="Label1" runat="server" Text="The city name"></asp:Label>
<asp:Label ID="note" runat="server" Text="Label"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Display" />
</div>
</form>
</body>
</html>
File: Default.aspx.vb
Partial Class MyPage
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
If Me.TextBox1.Text = "" Then
Me.note.Text = "Please input the city name"
Else
Me.note.Text = "The input is:" & Me.TextBox1.Text
End If
End Sub
End Class
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