How to use Button ClientClick event in asp.net

asp.net Button example: how to use ClientClick event
OnClientClickExample.aspx

<%@ Page Language="C#" %>

<!DOCTYPE html>

<script runat="server">
    protected void Button2_Click(object sender, System.EventArgs e) {
        Label1.Text = "Button2 Clicked!";
    }
</script>

<script  type="text/javascript">
    function AlertOnClientClick()
    {
        alert('OnClientClick event triggered!');
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>asp.net Button example: how to use OnClientClick event</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:Purple">Using OnClientClick event</h2>
        <asp:Label ID="Label1" runat="server" Font-Size="Large" ForeColor="DarkGreen"></asp:Label>
        <br /><br />
        <asp:Button ID="Button1" runat="server" Text="Click Me" OnClientClick="AlertOnClientClick()" Font-Bold="true" ForeColor="Teal" />
        <asp:Button ID="Button2" runat="server" Text="Button2" OnClick="Button2_Click" Font-Bold="true" ForeColor="Teal" />
    </div>
    </form>
</body>
</html>
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