How to Handle Server Event using ASP.NET 2.0 and VB.NET

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Controls Server Event Handling using ASP.NET 2.0 and VB

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This tutorial will show Controls how to Handle Server Event using ASP.NET 2.0 and VB.NET

An important feature of ASP.NET is that it allows you to program Web pages using an event-based model that is similar to that in client applications.If you already have an event handler, you can bind several control events to it. These multiple events can be from the same control or one event from several different controls, as long as the events all have the same method signature.

This tutorial only using the default namespace.The System namespace contains the EventHandler.

We use the Buttonx_Click event to connect multiple events to a single event handler. In the other word, Button1,Button2,Button3(multiple events will be connected to single event handler) will call same event handler. But this event handler will determine which Web Server Control Raised an Event. And then, we use the Button6_Click event to call eventd of both Button4 and Button5.

Protected Sub Buttonx_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles Button1.Click, Button2.Click, Button3.Click

Dim b As Button
b = CType(sender, Button)

Select Case b.ID

Case "Button1"
Label1.Text = "You clicked the first button"
Case "Button2"
Label1.Text = "You clicked the second button"
Case "Button3"
Label1.Text = "You clicked the third button"

End Select

End Sub

Protected Sub Button6_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button6.Click

End Sub

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The front end .aspx page looks something like this:

<table width="500" align="center" cellpadding="0" cellspacing="0">
<tr>
<td align="center" class="basix" height="50">
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label><br />
<asp:Button ID="Button1" runat="server" OnClick="Buttonx_Click" Text="Button1" />
<br />
<asp:Button ID="Button2" runat="server" OnClick="Buttonx_Click" Text="Button2" /><br />
<asp:Button ID="Button3" runat="server" OnClick="Buttonx_Click" Text="Button3" />
<br />
<asp:Button ID="Button4" runat="server" OnClick="Button4_Click" Text="Button4" />
<br />
<asp:Button ID="Button5" runat="server" Enabled="False" OnClick="Button5_Click" Text="Button5" /><br />
<asp:Button ID="Button6" runat="server" OnClick="Button6_Click" Text="Button6" /><br />
</td>
</tr>
</table>

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The flow for the code behind page is as follows.

Partial Class _Default

Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

AddHandler Button6.Click, AddressOf Button4_Click
AddHandler Button6.Click, AddressOf Button5_Click

End Sub

Protected Sub Buttonx_Click(ByVal sender As System.Object, _
ByVal e As System.EventArgs) _
Handles Button1.Click, Button2.Click, Button3.Click

Dim b As Button
b = CType(sender, Button)

Select Case b.ID

Case "Button1"
Label1.Text = "You clicked the first button"
Case "Button2"
Label1.Text = "You clicked the second button"
Case "Button3"
Label1.Text = "You clicked the third button"

End Select

End Sub

Protected Sub Button6_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button6.Click

End Sub

Protected Sub Button4_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button4.Click

Label1.Text = "You clicked the 4th button"

End Sub

Protected Sub Button5_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button5.Click

Label1.Text = Label1.Text + "You clicked the 5th button"

End Sub

End Class

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