Checking the IsPostBack Property

    <%@ Page Language="C#" %>

    <script runat="server">
       void Page_Load(Object Sender, EventArgs e) {
          if (!Page.IsPostBack) {
             lblMessage.Text = "Hello world!!!!";
          }
       }

       void Submit(Object Sender, EventArgs e) {
          lblMessage2.Text = "Form posted";
       }
    </script>

    <html><body>
       <form runat="server">
          <asp:Button id="btSubmit" runat="server" Text="Submit"
             onClick="Submit" />
          <p>
          <asp:Label id="lblMessage" runat=server />
          <p>
          <asp:Label id="lblMessage2" runat=server />
       </form>
    </body></html>

Event Handler

1:    <%@ Page Language="VB" %>
2:
3:    <script runat="server">
4:       Sub Button1_Click(Sender as Object, e as EventArgs)
5:          Label1.Text="You clicked <b>" & Sender.Text & "</b>"
6:       end Sub
7:    </script>
8:
9:    <html><body>
10:       <font size="5">Belajar ASP itu mudah</font><hr><p>
12:
13:       <form runat="server">
14:          <asp:Button id=Button1 runat="server" Text="Button1"
15:             onClick="Button1_Click" />
16:          <p>
17:          <asp:Label id=Label1 runat=server />
18:       </form>
19:    </body></html>

Typical Web Forms Page

1:    <%@ Page Language="VB" %>

2:

3:    <script runat="server">

4:       Sub tbMessage_Change(Sender As Object, E As EventArgs)

5:          lblMessage.Text = "Hello " + tbMessage.Text

6:       End Sub

7:    </script>

8:

9:    <html><body>

10:       <font size="5">Belajar ASP itu gampang</font><hr><p>

12:       <% Response.Write("Our First Page<p>") %>

13:

14:       <form runat="server">

15:          Please enter your name:

16:          <asp:textbox id="tbMessage"

17:             OnTextChanged="tbMessage_Change"

18:             runat=server/>

19:          <asp:button id="btSubmit" Text="Submit"

20:             runat=server/><p>

21:          <asp:label id="lblMessage" font-size="20pt"

22:             runat=server/>

23:       </form>

24:    </body></html>