Asp.Net Button Click Event Triggers

First of all, the main goal of this post is to demonstrate an example of triggering events in Asp.Net.

My asp.net page:

<asp:Button ID="Button1" runat="server" 
Text="Button 1" OnClick="Button1_Click" />
<br />
<asp:Button ID="Button2" runat="server" Text="Button 2" 
OnClick="Button2_Click" />
<br />
<asp:Button ID="Button3" runat="server" Text="Button 1 and 2" 
OnClick="Button3_Click" />
<br />
<asp:Label ID="lbl_output" runat="server" Text=""></asp:Label>

Code Behind:

    protected void Page_Load(object sender, EventArgs e)
    {
        Button3.Click += new EventHandler(Button1_Click);
        Button3.Click += new EventHandler(Button2_Click);
        
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        lbl_output.Text += "Button 1 clicked<br>";
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        lbl_output.Text += "Button 2 clicked<br>";
    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        lbl_output.Text += "Button 3 clicked<br>";
    }

Output with 3rd button click: